GARDENA Sprinklersystem T-Joint male thread: Connecting piece within the run of the pipe in pop-up sprinkler systems, 25 mm x 1/2 Inch male thread, Quick&Easy connection technology (2786-20)

Compatible with carlon 3/4 inch

Works well and easy to install, but also fairly easy to break. Be careful screwing your sprinkler to the fitting. Don't use much tape. Expensive and sometimes vendors on Amazon jack up the prices when they are low on stock. Installation to the pipe can be tricky, be sure to insert until you have a click and then go another couple of centimeters. Edit: third one broke out of 15, so this is weak. Treat it like glass. Don't use thread tape and tighten each fitting super carefully.

Be very careful when tightening this piece! I've snapped two of them by over-tightening slightly.