Couplings, Grooved Couplings and Fittings, Grooved Pipe Couplings manufacturer / supplier in China, offering 300psi/2.07map Red Painted Fire Fighting Grooved Coupling, Ductile Iron Grooved Pipe Fittings and Grooved Pipe Couplings Mechanical Tee Threaded Outlet, FM UL Approvals Grooved Plumbing Fittings and Grooved Elbow for Building Projects and so on.