... -568, PG standard and non-standard O-rings Features:1) Main products: O-rings (AS-568 standard, PG standard and any ... washer, oil seal, cup seals,gaskets, U-rings, V-rings, Y-rings, back-up rings, etc.2) Custom design rubber parts3) NSF approved ... rubber, nitrile rubber, EPDM, neoprene rubber, viton DuPont & Dow elastomers, natural rubber, SBR, fluorosilicone, acrylics5) Usual color: red, blue, yellow, ...