SharkBite 3/4 in. FIP Expansion Tank Tee FittingThe SharkBite Expansion Tank Tee is the perfect fitting to add an expansion tank for your water heater and other similar applications. It is used to connect to copper, CPVC. PE RT, and PEX piping. This tee allows up to a 2 inch section of pipe to be removed and then repaired without having to add additional pipe. Reliable, quick solution to add an expansion tank Works on any combination of copper, CPVC, PE RT, PEX piping 3 4 in. FIP x 3 4 in. FIP x 3