Ductile Iron Grooved Fitting rigid coupling is easy install and use.including Coupling,Adapter,Reducer,Elbow,Tee,Cross,Cap,Mechanical Tee,Mechanical Cross etc.   Material:Ductile Iron Gasket Material: EPDM Surface Treatment:Epoxy-RAL3000, Hot Galvanized Size:1"-8" Certification:FM and UL approval OEM is acceptale,or according to custom's special requirement Exported abroad directly from our own factories,so the price is competitive Usage: Grooved pipe fitting is widely used in water supply and drainage,fire protection coupling,petrochemical industry,water treatment,pharmaceutical,mining,construction and electric power industries.