Malleable Iron Pipe Fittings, Grooved Pipe Fittings, Pipe Hangers manufacturer / supplier in China, offering FM UL Certified Grooved Coupling - ASTM A536 & Qt450 - 10 Material, Grooved Rigid Coupling Used in Fire Protection FM / UL Listed Epoxy Painting, Superior Grooved Tee for Plumbing, Industrial and Utility Pipe Systems and so on.