T-Type Barbed Hose Fitting — 3-Way Plastic Tee Connector for Tubing & Irrigation

Match the barb outer diameter to your tubing's inner diameter. The size code format is Barb OD – Bore ID – Barb OD in millimeters. For example, a 6-4-6mm fitting has 6mm barbs and a 4mm bore — use it with tubing that has a 4mm inner diameter (≈ 5/32"). When in doubt, size down slightly; a snug barb grip generally seals better than a loose one.

These fittings are made from rigid plastic — typically polypropylene (PP) or a similar engineering-grade polymer — which is lightweight, corrosion-resistant, and suitable for low-pressure fluid transfer. The material is generally inert with water, dilute nutrients, and common aquarium-safe chemicals.

Plastic barbed fittings are generally rated for low-pressure applications, typically up to 30–60 PSI depending on tubing material, temperature, and fitting size. For higher-pressure systems, we recommend confirming compatibility with your specific setup before use. Adding hose clamps over the tubing at each barb can improve retention at higher pressures.

Yes. The plastic construction is corrosion-resistant and generally suitable for outdoor and wet environments such as garden drip irrigation, greenhouse misting systems, and aquarium plumbing. Prolonged direct UV exposure may cause gradual surface degradation in some plastics over time; shading or covering the fittings in permanent outdoor installations is advisable.

Yes. The size notation is in millimeters and corresponds directly to standard metric flexible tubing dimensions. Always verify your tubing's inner diameter matches the fitting's bore ID (the middle number in the size code) before ordering. Common compatible tubing types include flexible PVC, silicone, and rubber hose.

For most low-pressure applications, the barbed design provides a secure push-fit connection without clamps. For higher-flow or higher-pressure setups — or anywhere a leak would cause damage — adding a small hose clamp over the tubing at each barb is generally recommended for added security and peace of mind.

The three numbers represent: Barb 1 Outer Diameter – Center Bore Inner Diameter – Barb 2 Outer Diameter, all in millimeters. So 8-4-8mm means both side barbs are 8mm OD and the through-bore is 4mm ID (≈ 0.31" × 0.16"). The T-branch port typically shares one of the barb dimensions — see the product images or contact us to confirm the branch port size for a specific variant.

Yes, these plastic tee fittings are commonly used in aquarium and fish tank setups for splitting air lines or water return tubing. They are generally inert and safe for freshwater use. For saltwater or chemically treated water, confirm material compatibility before use. The smaller sizes (3-2-3mm and 6-4-6mm) are typically well-suited for standard aquarium air tubing.