... rubber washers for you . Detailed Product Description Features:1) Available material: materials for silicone, NBR, fluorosilicone,viton (FKM), viton DuPont & Dow ... ), CR (neoprene), SBR, AU, ACM, CO, etc. NSF-61 approved material, meet drinking water system requirements 2) All manufacturing processes confirm ... iron, copper, aluminium and stainless steelInner packing:500pcs/bag Rubber seals