Equal Lock-Nut Drip Irrigation Tee, 16 or 20 mm

A retaining nut on all three arms

The equal lock-nut irrigation tee creates a branch between three matching irrigation lines. Its black T-shaped body carries a blue retaining nut on each arm, including the upright branch. Use the fitting to add a side run while keeping the other two sections aligned. The three connections share the selected nominal size, making the tee a practical choice where the branch uses the same line size as the through run.

Select one size for the whole tee

Choose the 16 mm option for a matching 16 mm layout or the 20 mm option for a matching 20 mm layout. Check the line type and its fit over the connection end as well as the nominal diameter. Wall thickness and line construction can affect seating, so compare an existing fitting or a sample before changing a larger group of connections. Each blue nut retains a line end; the upright arm follows the same connection style as the other two arms.

Install without stressing the branch

Position the tee where the side line can leave the through run without a sharp bend. Cut all three line ends square and keep dirt out of the opening. Seat the lines fully before securing the retaining nuts. Support the nearby lengths so movement in one row does not twist the entire joint. Run water through the layout gradually and inspect every connection. Address leaks with the water off by checking fit, seating and alignment. Recheck the tee after repositioning the lines, and keep the branch accessible for routine maintenance.