Plastic Tee Hose Joiner Barb T-Piece 3 Way Connector Pipe Fitting Air Fuel Water

Match the barb size to the inner diameter (ID) of your flexible tubing, not the outer diameter. For example, if your hose has a 6mm inner bore, select the 6mm barb. A barb that is slightly larger than the ID will stretch the tubing for a tighter grip; a barb that is too small will allow the hose to slip off under pressure.

For low-pressure applications such as aquarium air lines, drip irrigation, or gravity-fed water systems, the barbs typically hold the tubing securely without clamps. For higher-pressure or vibration-prone environments — such as automotive fuel or coolant lines — adding a worm-drive or crimp clamp over each barb is strongly recommended to prevent leaks.

These fittings are suitable for light fuel and oil contact in short-duration or low-concentration applications. However, prolonged exposure to petroleum-based fuels, solvents, or aggressive chemicals may degrade the plastic over time. For continuous fuel-line use, verify compatibility with your specific fuel type and consider a fuel-rated fitting if in doubt.

Standard natural-plastic variants may experience some UV degradation over extended outdoor exposure. The 4mm Black variant is better suited for outdoor or engine-bay installations where a darker color is preferred. For long-term outdoor use in direct sunlight, consider shielding the fitting or using UV-stabilized tubing to extend service life.

Exact pressure ratings depend on the specific size, tubing material, and operating temperature. As a general guideline, plastic barb fittings of this type are typically used in systems operating below 30 PSI (approximately 2 bar). For higher-pressure systems, consult the tubing manufacturer's specifications and use appropriate clamps.

Cut your tubing cleanly and squarely. If the tubing is stiff, briefly warm the end in warm water to soften it. Push the tubing firmly onto each barb port until it seats past the last barb ridge. Rotate the tubing slightly as you push to help it seat evenly. For pressurized lines, slide a hose clamp onto the tubing before inserting the barb, then tighten the clamp over the barb after seating.

Yes. The T-piece is symmetrical and works in both configurations. You can split one supply line into two branches, or combine two low-flow lines into a single outlet. Keep in mind that combining two flows into one outlet increases the total flow rate through that port, so ensure the downstream tubing and fittings are rated for the combined flow.