O-rings (AS-568 standard) O-ring (Rubber o-ring,Silicone o-ring,o-ring seal) Features: 1) Main products: O-rings (AS ... -568 standard, PG standard and any non-standard o-ring), washer, oil seal, cup seals, gaskets, U-rings ... etc.2) Custom design rubber parts3) Materials include: silicone rubber, nitrile rubber, EPDM, neoprene rubber, viton DuPont & Dow elastomers, natural rubber, SBR, fluorosilicone, ...