Product Description Product Description  Ductile Iron Cast Iron Grooved Pipe Fittings Reducing CouplingFM/UL Rigid or Flexible Couplings/Reducing Tee/Mechanical Tee/Elbow/Cross/Flange/Reducer/Cap/Grooved Pipe Fittings Grooved CouplingsFM/UL Rigid or Flexible Couplings/Reducing Tee/Mechanical Tee/Elbow/Cross/Flange/Reducer/Cap/Grooved Pipe Fittings Grooved Couplings Ductile iron grooved pipe fittings and couplings (FM and UL approved) mainly including 2 kinds of grooved products:(1) the pipe fittings function on … Continue reading China best Ductile Cast Iron Grooved Flexible Coupling