The DiversiTech QTM-1 1/4, 5/16, 3/8 in. OD tube size MAC line piercing valve tool features one connection for piercing and servicing. The needle automatically back-seats after servicing which leaves the line free of restriction. Connects to tubing with two socket-head screws. When hose is removed, spring loaded needle back-seats forming a leak proof seal. Needle depressor is discarded and wing cap forms extra precautionary seal.