Unitary Clamps, Heavy Duty Clamps, A type heavy duty pipe couplings. Material: Carbon steel, stainless steel. Unitary Clamps, Heavy Duty Clamps, A type heavy duty pipe couplings.Material: Carbon ... & Valve Parts,++Steel and Stainless steel Hose clamps.++Plastic, Poly, PVC, Nylon injection parts.++Mold Design.Material available: Ductile Iron, Gray ...