DJI Agras T50 OEM Y-Tee Spray Tank (YC.JG.ZS002232)

Y-Tee Spray Tank Part | Spray System Y-Splitter Fitting | Fluid Distribution Tee | Tank Line Y-Connector | Field-Ready Replacement Component | DJI Material Number YC.JG.ZS002232

DJI Material Number (SKU): YC.JG.ZS002232 — this is the official DJI part number for this exact component. Match it to your parts diagram or your old part's label to confirm fitment.

---

🇺🇸 U.S.A. FIRST

Ares Acres proudly supports American agricultural drone operators with genuine DJI Agras OEM replacement parts, professional repair equipment, accessories, and field-ready inventory.

FREE & FAST Shipping is included for all U.S. customers.

Every even spray pattern starts with even flow — and even flow starts at the fittings that split the tank's output down the liquid path. The Y-Tee is one of those quiet dividers: one line in, two lines out, balanced delivery to both sides of the spray system on every single pass.

When a Y-Tee cracks or its ports wear loose, the symptoms scatter — a drip here, a pressure imbalance there, one boom running lean while the other runs rich — and operators chase nozzles and pumps while a five-dollar fitting quietly bleeds the system.

That is why Ares Acres keeps hard-to-find spray system fittings in stock and shipped fast to the U.S.A., helping operators keep flow balanced, minimize downtime, and keep their aircraft spraying when every acre counts.

For professional farmers, aerial applicators, and commercial drone operators, healthy fittings are where even coverage begins.

---

✅ DJI Agras T50 / T40 / T20P / T25 / T60 / T70 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking

---

📦 Package Includes

• 1 × DJI Agras Y-Tee Spray Tank Part
• Corrosion-resistant molded Y-fitting
• Direct-fit replacement component
• Protective packaging

---

🔧 Component Overview

The DJI T50 - T40 Y-Tee Spray Tank part is a molded fluid distribution fitting for the spray systems of the DJI Agras family, with listed fitment across the T40, T50, T20P, T25, T60, and T70 agricultural drones.

The Y-Tee splits the tank's fluid line into balanced branches, keeping delivery smooth and even through the spray system. Built from durable, corrosion-resistant material, it stands up to the chemical loads, pressure cycling, and vibration of daily commercial work — and swaps in quickly when the old fitting cracks, clogs, or wears loose.

Commercial agricultural drones operate in demanding environments every day, including:

• Crop spraying
• Liquid fertilizer application
• Herbicide treatments
• Fungicide applications
• Insecticide spraying
• Orchard operations
• Vineyard spraying
• Specialty crop programs
• Precision agriculture missions
• Daily commercial deployments
• Fleet operations
• High-acreage contract work

Throughout these operations, spray fittings are routinely exposed to:

• Constant liquid flow and pressure cycling
• Abrasive chemical formulations
• Chemical corrosion attack
• Undissolved fertilizer particles
• Vibration at every connection
• Hose tension and flex loading
• Pressure-washing and rinse cycles
• UV exposure
• Heat cycling in summer conditions
• Grit from field-side fills
• Long commercial operating hours

Over time, this duty cracks bodies, wears ports, and degrades sealing surfaces — and a compromised Y-Tee means leaks, imbalanced flow, and coverage the operator can't trust.

The Y-Tee Spray Tank Part helps maintain:

• Balanced fluid distribution
• Even delivery to both branches
• Leak-free line connections
• Full spray system pressure
• Consistent application coverage
• Protected downstream components
• Consistent maintenance standards
• Increased fleet readiness
• Maximum aircraft uptime
• Reliable commercial operation

For operators whose results are judged acre by acre, healthy fittings keep the flow — and the coverage — even.

Find the leak standing still rather than in the air. Flush the system, fill with clean water only, park the aircraft over dry cardboard or clean concrete, and run the pump against the nozzle set while you watch the junction directly with a light. A fitting that holds when the system is static will very often weep the moment it is pressurised, which is exactly why walking around a parked aircraft looking for drips finds nothing and a two minute pressure run finds it immediately.

Separate a cracked body from a leaking joint before deciding what to buy. Clean and dry the whole fitting, wipe it down so the surface is bare, then pressurise again and watch where the wet comes back. A crack weeps along a line and reappears in the same hairline every time. A port problem weeps at the joint where hose meets barb, moves when the hose is nudged, and stops for good once the hose end and clamp are properly reseated.

Look for fine white branching lines radiating from the crotch of the Y and from the root of each barb. That is chemical and stress crazing, and it appears before anything drips. A fitting showing crazing at a stress riser is finished whether it is leaking today or not, because the crack front is already there and pressure cycling only has to open it. That is the one finding worth acting on with no other evidence at all.

Prove a flow imbalance with a catch test rather than by eye off the crop. With clean water in the tank and matched nozzles fitted, catch each branch into a marked jug for the same length of time and compare what you collect. A meaningful difference between two branches fed from the same splitter points at a partial obstruction, a swollen passage or a deformed seat inside the fitting, none of which is visible from the outside while the fitting is on the aircraft.

Chase a system that surges without leaking on the suction side of the pump. A hairline crack or a loose barb upstream of the pump pulls air instead of pushing liquid, so nothing ever drips on the ground. The signature is pressure that oscillates, nozzles that spit and stutter, foam building in the tank, and flow readings that wander with no visible wet anywhere. Pressurised leaks drip; suction leaks breathe, and operators lose whole afternoons to the difference.

---

⚙️ Functional Purpose

The Y-Tee Spray Tank Part is designed to split and balance fluid flow through the DJI Agras spray system.

The component helps:

• Divide the fluid line into balanced branches
• Maintain even flow to both sides of the system
• Hold leak-free connections at all ports
• Preserve spray system pressure
• Resist chemical corrosion in the liquid path
• Withstand vibration and hose loading
• Replace cracked, clogged, or worn fittings
• Restore factory flow geometry
• Install quickly to minimize downtime
• Maintain correct fitment across supported models
• Support preventative maintenance
• Reduce preventable leaks
• Reduce preventable downtime
• Increase fleet readiness
• Keep spare fittings field-ready

Even coverage starts upstream — at the fittings that decide how the flow divides.

A healthy Y-Tee keeps both branches fed evenly through season after season of commercial work.

A cracked or worn Y-Tee may contribute to:

• Leaks at the fitting ports
• Imbalanced flow between branches
• Uneven spray coverage
• Pressure loss in the system
• Chemical drips and waste
• Misdiagnosed nozzle and pump issues
• Interrupted spraying missions
• Unexpected downtime
• Higher repair costs over time
• Reduced fleet reliability

Replacing worn fittings restores the balanced distribution the spray system was engineered around.

Flush and rinse before anything is opened. Empty the tank, run clean water through the whole system until it runs clear, and rinse again. Do not open a fluid junction with concentrate or loaded mix still in the lines. Wear the protection you would wear while mixing, because residue collects at low points and junctions and whatever comes out of that fitting is usually more concentrated than anything you poured in.

Release the pressure before you release the clamp. Spray plumbing holds pressure after the pump stops, and a clamp cut loose on a charged line puts tank mix into a face. Run the system briefly to a stop, allow it to bleed down, then break the joint slowly with a rag wrapped around it and a container underneath to catch what is still in the line.

Photograph the junction before it comes apart and note which leg is the inlet and which plane the two branches sit in. A Y put back rotated a quarter turn from where it was is the classic cause of a hose that now has a kink, a tight run or a rub against a moving part, and none of that shows itself until the aircraft is loaded and working.

Get the old hose off without wrecking the barb. Do not lever a screwdriver between the hose and the fitting. Slit the hose lengthwise with a hooked blade, working away from the barb, and peel it off. Levering splits the barb root, and the barb root is exactly where these fittings crack. If the fitting is being reused for any reason, a nicked or scored barb will never seal again no matter what clamp goes over it.

Prepare the hose ends properly. Cut square with a hose cutter rather than sawing at an angle with a pocket knife, because a ragged or angled end is a leak path that no clamp closes. Ease the hose on with warm water rather than any oil, grease or petroleum lubricant, since those attack the tubing and contaminate the tank. Push the hose fully home to the shoulder so the clamp lands over the barb body rather than behind it.

Place and tighten clamps deliberately. The clamp belongs over the barb, seated in the groove between barbs where the fitting is designed to be squeezed, not out on bare hose where it does nothing. Refit the same style of clamp that came off, and use the correct tool for a pinch clamp rather than improvising with pliers. Overtightening a worm clamp on soft tubing cuts a slow ring into the hose that fails weeks later.

Leave the run slack and prove it with water. A hose pulled tight levers on the port every time the airframe flexes, and that side load is the single most common reason a moulded fitting cracks at the crotch. Route so the fitting carries fluid and nothing else, then pressurise with clean water, check the junction, and check it again twenty minutes later, because seepage shows up late and chemicals are not the thing to discover it with.

---

⚠️ Common Replacement Indicators

Replacement may be recommended when operators observe:

• Cracked or fractured fitting body
• Leaking or weeping at any port
• Worn or loose hose connections
• Visible flow imbalance between branches
• Stubborn clogging that flushing won't clear
• Chemical-related deterioration or discoloration
• Brittle, UV-aged plastic
• Deformed ports from hose tension
• Pressure loss traced to the fitting
• Maintenance inspection findings
• Seasonal spray system rebuilds
• Fleet refurbishment projects
• Preventative pre-season replacement
• Long-term commercial wear

Common causes of Y-Tee failure include pressure cycling fatiguing the molded body, chemical attack softening the material, hose tension stressing the ports, UV embrittlement from all-day exposure, and grit scouring the internal passages — fittings are consumables by design, and experienced crews inspect every junction during seasonal rebuilds and swap any fitting showing stress lines before it splits mid-tank.

For commercial operators, preventative fitting replacement is almost always cheaper than the chemical lost and the field time burned chasing a hidden leak.

A damp ring or a chemical crust under one point of the aircraft after it has sat with a full tank. That is a static leak, which usually means a crack in the body or a hose end that is not seated all the way home. Wipe it clean, refill with clean water, and see whether it comes back in the same spot.

Wet at the junction only while the pump is running, dry once it stops. That is a pressure dependent leak, typical of a hairline crack, a stretched hose end or a clamp that has lost its tension. It will get steadily worse as the season goes on, and it wastes product every minute the boom is on.

Pump pressure that surges and nozzles that spit, with nothing dripping anywhere. Look upstream of the pump for air being drawn in through a crack or a loose barb. Foam building in the tank alongside the surging almost confirms it, because that foam is air being churned back into the mix.

One side of the pattern consistently lighter than the other with clean, matched nozzles. Something is dividing the flow unevenly. Catch test each branch before condemning nozzles, then look inside the splitter for scouring, a swollen passage or lodged debris.

Fine white lines branching out from the crotch of the Y or around the root of a barb. That is stress crazing, and it is a replace now finding even with no leak. The material has already started to fail and pressure cycling is simply waiting to finish the job.

Persistent clogging that flushing will not clear. Something is getting past the strainer. Pull the fitting, hold each leg up to a light, and back flush it, then go and find out why debris is reaching that far into the system rather than just cleaning the symptom.

A joint that starts weeping shortly after unrelated work was done nearby. Hoses that were pushed aside, a clamp that got nudged, or a fitting that was levered against during another repair. Fittings that have been disturbed frequently fail soon afterwards, which is why it is worth checking every junction you touched before flying.

A split found on the first fill of the spring after winter storage. Water left standing in the plumbing froze and expanded, and moulded fittings and low points are where that shows first. Expect to find more than one, and check the whole fluid path rather than replacing only the fitting that gave you away.

---

📐 Specifications

DJI Material Number: YC.JG.ZS002232

Component Type: Y-Tee spray fitting / fluid distribution splitter

Compatibility:

• DJI Agras T70
• DJI Agras T60
• DJI Agras T50
• DJI Agras T40
• DJI Agras T25
• DJI Agras T20P

Package Quantity: 1 Piece

Installation Area: Spray tank fluid line junction

Function: Splits and balances fluid flow through the spray system

Design: Molded Y-junction with secure hose ports

Construction: Durable, corrosion-resistant molded material

Mounting Type: Direct-fit replacement component

Application: Agricultural drone spray system maintenance

Port and Barb Sizes: Barb diameters are not published as loose component data. Compare the removed fitting leg by leg before ordering, since the inlet and the two branches are not always the same size

Junction Style: Y form splitter, where the two branches leave at an angle from a common crotch. A right angle T body is a different fitting and will route hoses differently even where the function is similar

Pressure Rating: Not published by DJI for this component. Do not judge a substitute by hardware store equivalence; match the DJI material number and the original barb pattern

Service Class: Treat as a consumable. Inspect every junction at seasonal rebuild and carry spares, since replacement is a bench job measured in minutes and a failure in the field is measured in acres

---

🚜 Necessary For

This component is ideal for:

• DJI Agras T70 operators
• DJI Agras T60 operators
• DJI Agras T50 operators
• DJI Agras T40 operators
• DJI Agras T25 operators
• DJI Agras T20P operators
• Farmers operating spray drones
• Commercial spraying contractors
• Agricultural aviation companies
• Fleet maintenance managers
• Agricultural drone technicians
• DJI Agras service providers
• Drone repair facilities
• Commercial drone fleets
• Precision agriculture businesses
• Spray system rebuild projects
• Preventative maintenance programs
• Daily commercial operations
• Emergency repair inventory
• Professional agricultural drone operators

Especially valuable during:

• Spring spraying season
• Summer application windows
• High-tempo fill-and-fly operations
• Spray system service work
• Multi-aircraft fleet maintenance
• Seasonal rebuilds
• Emergency repairs
• High-hour commercial operations

When the aircraft is needed to generate revenue, keeping spare fittings on the shelf keeps operations moving.

Chasing down a slow chemical loss that shows up as product used not matching acres covered, where the tank empties faster than the job accounts for and nobody has found the drip because it only appears under pressure.

Rebuilding the fluid path after winter storage, where water left in the lines has frozen and split low points and moulded junctions, and the operator wants everything that carries liquid checked before the first load of the season.

Correcting a persistent side to side coverage difference that survived a full nozzle clean, a screen clean and a pump check, where the splitter is the last untested component between the pump and the booms.

Fixing a suction side air leak that has been presenting as pump surging, spitting nozzles and wandering flow readings with no visible wet anywhere on the airframe.

Stocking the truck for contract work, where a two minute fitting swap at the tailgate is the difference between finishing a field on schedule and driving back for a part that costs less than the fuel to fetch it.

---

💡 Why This Part Matters

Nobody photographs the Y-Tee. It sits in the middle of the fluid path doing invisible work — splitting every gallon into balanced halves so the spray system delivers evenly on both sides of every pass. Right up until it cracks, and suddenly the invisible part is the reason coverage looks streaky and the airframe smells like product.

The cruel part is the diagnosis: a failing fitting mimics everything else. Operators clean nozzles, check pumps, and swap discs while the real problem drips quietly at a junction. The crews that skip that goose chase are the ones who inspect fittings at every rebuild and keep spares in the kit — because a fitting swap takes two minutes when the part is on the truck.

The Y-Tee Spray Tank Part helps maintain:

• Balanced, even flow
• Leak-free junctions
• Full system pressure
• Consistent coverage quality
• Fast, cheap field fixes
• Cross-fleet fitment (T20P through T70)
• Professional fleet standards
• Increased aircraft uptime
• Reliable commercial performance
• Long-term operational confidence

Running a worn fitting, operators risk:

• Hidden leaks and chemical waste
• Imbalanced, streaky coverage
• Pressure loss mid-mission
• Wasted diagnostic hours
• Interrupted missions
• Unexpected downtime
• Lost spraying opportunities
• Reduced return on investment

For practical, hardworking operators, the value is simple:

Protect the flow. Protect the coverage. Protect the mission. Protect the season.

Professional DJI Agras operators understand that spray system reliability is built one fitting at a time. Keeping spare Y-Tees on hand means a two-minute swap at the truck instead of an afternoon of leak-chasing — and that difference is what separates a good season from a frustrating one.

While the junction is apart, change what is around it. The hose stubs on both sides have lived exactly as long as the fitting, seen the same chemistry and the same UV, and they are the cheapest part of the whole job. Clamps that came off corroded, distorted or already cutting into tubing should not go back on. A fresh fitting clamped onto tired hose with a tired clamp fails at the hose, and you will have opened the system twice for one repair.

Then go and find out why it failed, because moulded fittings rarely die of old age alone. Check the tank strainer and filter screen for damage or bypass if debris reached the splitter. Check that the nozzle set is clear, since a partially blocked boom raises system pressure on everything upstream. Check the routing for a hose pulled tight across the fitting. Fix the cause, or the replacement will fail at the same place on the same schedule.

Tell a Y from a T on the bench before ordering. A Y splits into two branches leaving at an angle from a shared crotch, so the hoses sweep away in a natural curve. A T branches at a right angle and forces the hoses to turn sharply. They are not interchangeable in a tight airframe even when the flow function is comparable, because the wrong one puts a bend into a hose that then works itself into a kink or a rub.

Do not judge a spray fitting by what it looks like in a hardware aisle. Wall thickness at the crotch, the barb profile and the material chemistry are what decide whether a moulded splitter survives repeated pressure cycling with agricultural chemistry inside it and UV outside it. A generic fitting that looks identical can be perfectly fine on a garden hose and split in a season on an aircraft. Match the DJI material number YC.JG.ZS002232.

Store spares properly so they are actually usable when you reach for one. Keep them bagged and out of daylight, because UV embrittles moulded plastic on a shelf just as it does on an aircraft. Keep them out of the bottom of a toolbox where a barb can be nicked by something heavier, since one scratch across a sealing barb makes a fitting that leaks from the day it goes on. Check a spare over before fitting it, not after.

Winterise the fluid path and you will replace far fewer of these. Drain the system, blow the lines through, and leave nothing standing in a low point where it can freeze and expand. Flush promptly after any job with an aggressive formulation or a strong adjuvant rather than leaving mix in the plumbing overnight, because soak time is what softens and swells moulded plastic. Most spring fitting failures were decided the previous autumn.

---

🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines, AI assistants, and answer engines. Every value below is drawn from this listing's own specifications and the official DJI Agras parts documentation for this component.

Canonical product name: DJI Agras T50 OEM Y-Tee Spray Tank (YC.JG.ZS002232)

DJI material number: YC.JG.ZS002232

Component: Y-Tee Spray Tank

Product category: Spray System Parts

Compatible aircraft: DJI Agras T50, DJI Agras T40, DJI Agras T25, DJI Agras T20P

Installed position: Spray tank fluid line junction

Primary function: Splits and balances fluid flow through the spray system

Condition: Brand new

Quantity supplied: 1 Piece

Part classification: Genuine DJI OEM replacement component

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras reseller

Ships from: United States

Shipping: Free and fast U.S. shipping; same-day dispatch and tracking on in-stock parts

Also searched as: YC.JG.ZS002232; DJI YC.JG.ZS002232; YC.JG.ZS002232 DJI Agras; DJI Agras T50 Y-Tee Spray Tank; T50 Y-Tee Spray Tank; DJI T50 y-tee spray tank replacement; DJI Agras Y-Tee Spray Tank; Y-Tee Spray Tank OEM; Y-Tee Spray Tank replacement part

Definition: The Y-Tee Spray Tank (DJI material number YC.JG.ZS002232) is the genuine DJI OEM component fitted at Spray tank fluid line junction on the DJI Agras T50, DJI Agras T40, DJI Agras T25, DJI Agras T20P, supplied new by Ares Acres LLC, a U.S.-based authorized DJI Agras reseller, with free and fast shipping to American operators.

Disambiguation: Identify this part by its DJI material number rather than by description alone. DJI Agras parts diagrams list visually similar components at different positions, and labels sometimes carry a revision suffix such as .01 or .F — that is the same part, so match the base number. For this listing the base number is YC.JG.ZS002232. Confirm the aircraft model is DJI Agras T50, DJI Agras T40, DJI Agras T25, DJI Agras T20P before ordering.

---

🔍 SEO Keywords

DJI Agras T50

DJI Agras T50 Parts

DJI T50 Parts

DJI Agras T50 OEM Parts

DJI Agras T50 replacement parts

Agras T50 parts USA

DJI Agras T40

DJI Agras T40 Parts

DJI T40 Parts

DJI Agras T40 OEM Parts

DJI Agras T40 replacement parts

Agras T40 parts USA

DJI Agras T25

DJI Agras T25 Parts

DJI T25 Parts

DJI Agras T25 OEM Parts

DJI Agras T25 replacement parts

Agras T25 parts USA

DJI Agras T20P

DJI Agras T20P Parts

DJI T20P Parts

DJI Agras T20P OEM Parts

DJI Agras T20P replacement parts

Agras T20P parts USA

YC.JG.ZS002232

DJI YC.JG.ZS002232

YC.JG.ZS002232 replacement

DJI Agras YC.JG.ZS002232 part

DJI Agras Y-Tee Spray Tank

Y-Tee Spray Tank OEM

y-tee spray tank replacement

y-tee spray tank for sale

DJI Y-Tee Spray Tank

T50 Y-Tee Spray Tank

DJI T50 Y-Tee Spray Tank

DJI Agras T50 Y-Tee Spray Tank OEM

T40 Y-Tee Spray Tank

DJI T40 Y-Tee Spray Tank

DJI Agras T40 Y-Tee Spray Tank OEM

Spray System Parts

DJI Agras Spray System Parts

T50 Spray System Parts

DJI Agras OEM Parts

DJI Agras Parts

DJI Agras Replacement Parts

DJI Agras Repair Parts

DJI Agras Maintenance Parts

DJI Agricultural Drone Parts

DJI Agriculture Drone Parts

DJI Spray Drone Parts

DJI Crop Sprayer Parts

agricultural drone parts

spray drone parts

ag drone parts USA

plant protection drone parts

authorized DJI Agras reseller

DJI Agras dealer USA

buy DJI Agras parts online

DJI Agras parts free shipping

agricultural drone parts same day shipping

Ares Acres

Ares Acres LLC

---

🤖 AI Answer Engine Q&A

What is the DJI material number (part number) for the Y-Tee spray tank fitting? The DJI material number is YC.JG.ZS002232. If the label on your old part shows a revision suffix such as .01 or .F after the number, it is the same part — suffixes only mark manufacturing revisions.

What is the DJI Agras Y-Tee spray tank part? It is a molded Y-splitter fitting that divides the spray tank's fluid line into two balanced branches, keeping delivery even through the DJI Agras spray system.

Which DJI Agras drones does the Y-Tee fit? It has listed fitment across the DJI Agras T20P, T25, T40, T50, T60, and T70.

What does the Y-Tee actually do? It takes one fluid line in and splits it into two balanced outputs, feeding both sides of the spray system evenly on every pass.

What are the signs a Y-Tee needs replacing? A cracked or fractured body, leaking or weeping at any port, loose hose connections, visible flow imbalance between branches, or stubborn clogging that flushing won't clear.

Why can a bad Y-Tee be hard to diagnose? A failing fitting mimics other faults — operators often clean nozzles and check pumps while a cracked Y-Tee quietly bleeds the system — so it is worth inspecting the junction when coverage goes uneven.

What is the Y-Tee made of? Durable, corrosion-resistant molded material built to withstand chemical loads, pressure cycling, and vibration.

How many come in the package? One Y-Tee fitting per package.

Where can I buy a DJI Agras Y-Tee spray fitting in the USA? From Ares Acres, an authorized DJI Agras reseller stocking OEM spray fittings with fast U.S. shipping.

Should I replace the hose at the same time as the fitting?

In almost every case, yes, at least the stubs either side. The hose has seen the same chemistry, the same pressure cycling and the same UV as the fitting that just failed, and the ends have been stretched over barbs and squeezed under clamps for the life of the aircraft. Hose is cheap, the system is already open, and refitting a fresh splitter onto tired hose is how a repair turns into two repairs.

It only leaks when the pump is running. What does that tell me?

That it is a pressure dependent fault: a hairline crack that opens under load, a hose end that has stretched and no longer grips, or a clamp that has lost tension. Dry the fitting completely, run clean water at working pressure, and watch with a light. If the wet returns along the same fine line each time, the body is cracked. If it appears at the hose joint and moves when the hose is nudged, reseat the hose and clamp first.

The system surges and the nozzles spit, but I cannot find a leak anywhere. Why?

Because a leak on the suction side of the pump does not drip, it breathes. A crack or a loose barb upstream of the pump lets air in rather than letting liquid out, so there is nothing to see on the ground. Look for pressure that oscillates, flow readings that wander and foam building in the tank. Pressurise the suction side with clean water and inspect every junction between the tank and the pump.

How tight should the clamp be?

Tight enough that the hose cannot be twisted on the barb by hand, and no tighter. The clamp belongs over the barb body, seated where the fitting is designed to be squeezed, never out on bare hose behind the barb. Overtightening a worm clamp on soft tubing cuts a ring into it that will fail weeks later, well after everyone has forgotten the repair. Refit the same style of clamp the aircraft came with.

What is the safe way to get old hose off without damaging anything?

Slit it. Use a hooked blade to cut the hose lengthwise, working away from the fitting, then peel the hose off the barb. Never lever a screwdriver in between the hose and the barb, because that splits the barb root, and the barb root is where these fittings crack. Warm water helps a stubborn hose ease off, and it helps the new one go on without oil or grease that would contaminate the tank.

Can a cracked splitter be glued or patched to finish the day?

Do not plan on it. A fluid junction sees pressure cycling and constant vibration, and adhesive or tape on a moulded plastic body under those conditions fails without warning, usually with a full tank and always at the least convenient time. If the fitting is crazed or cracked it is finished. That is exactly why these are cheap enough to carry as spares in the truck rather than repair at the field edge.