LASCO 19-5147 Tee Compression Fitting with 3/8-Inch OD and 1/4-Inch Male Pipe Thread, Nylon Nylon compression fitting with integral sleeve nut Use for hot or cold water 3/8-inch od x 3/8-inch od x 1/4-inch male pipe tee No need to disassemble fitting - just loosen the nut, insert tubing, then tighten Use on copper, PEX, poly and aluminum tubing