1)Groove fittings and couplings 2)Ductile iron 3)FM/UL/ISO ... :st 5)Galvanized Galvanized Fire Protection Grooved Fittings Tee:1)Groove fittings and couplings,elbow,tee,cross,flange,reducer, 2)Ductile iron ASTM ... mechanical pipe joining system available. Galvanized Fire Protection Grooved Fittings Tee