Grooved Flexible Couplingsis similar as Grooved Rigid Couplings, alsouse for the firefighting works. But this kind ofGrooved Pipe Couplings can be adjusted if the different corner afterconnect two equal pipes.They are all good quality with excellent material. Material: Ductile Iron Casting, conforming to ASTM A536 65-45-12 Equal to QT450-12. Size:1-12"-12" Coating: 1.Painting 2.Epoxy 3.Dacromet 4.Galvanized Colour: 1.Red 2.Blue 3.White 4.Orange Packing: Carton on Pallets or as negotiation.