The Poly Tank Adapter (also known as a bulkhead fitting) is the essential component for turning any plastic drum, tank, or rain barrel into a functional water reservoir. By creating a watertight, threaded outlet at the bottom of your container, this adapter allows you to easily connect shut-off valves, spigots, or supply lines to your gravity-feed system.
Manufactured from high-density polypropylene with a heavy-duty EPDM gasket, this fitting withstands exposure to harsh weather and agricultural chemicals. It is one of the most critical irrigation fittings for rainwater harvesting setups, allowing you to transition from a static storage tank to standard pipe threads without leaks or cracks.
Use these dimensions to select the correct hole saw for installation.
| Specification | Details |
|---|---|
| Product Type | Bulkhead Fitting / Tank Adapter |
| Connection (Internal) | Female Pipe Thread (FPT) |
| Material | Glass-Reinforced Polypropylene |
| Gasket Material | EPDM Rubber |
| Manufacturer | Aqualine |
| MPN (3/4") | TBH-075 |
| MPN (1") | TBH-100 |
| MPN (1 1/2") | TBH-150 |
| MPN (2") | TBH-200 |
| Required Hole Sizes |
1/2": 1-1/4" to 1-3/8" Hole 3/4": 1-3/8" to 1-1/2" Hole 1": 1-3/4" Hole 2": 3" Hole |
Proper installation is critical to prevent leaks.
Step 1: Drill the Hole
Using a hole saw, drill the appropriate size hole near the bottom of your tank or barrel. Ensure the surface is clean and deburred.
Step 2: Insert the Fitting
Place the gasket on the body of the fitting. From the inside of the tank, push the threaded body through the hole. The gasket must be on the inside against the water.
Step 3: Tighten the Nut
Thread the locking nut onto the protruding threads on the outside of the tank. Hand-tighten firmly, then give it another partial turn with a wrench. Do not overtighten.
Step 4: Connect Your Valve
Wrap thread seal tape around your spigot or male adapter and screw it into the internal threads of the bulkhead fitting.
Ensure this adapter fits your plan:
Finish your tank setup with these recommended components:
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