Grooved Fittings, Grooved Fittings & Couplings, Grooved Couplings manufacturer / supplier in China, offering Ductile Iron Grooved Pipe Fittings Rigid Coupling and Fllexible Coupling, FM Approval Grooved Flange Adapter 6"-168.3mm, UL Listed FM Approval Ductile Grooved Iron Reducer Tee and so on.