LASCO 19-6137 Reducing Tee Push-In Fitting with 1/2 x 1/2 x 3/8-Inch OD Tubing, Plastic Plastic push in fitting 1/2 x 1/2 x 3/8-inch OD Tubing, Reducing Tube x tube x tube tee Good for use on PEX, poly, copper OD tubing Clean tubing, push in by hand