... O-rings (AS-568 standard) O-ring (Rubber o-ring,Silicone o-ring,o-ring seal) ... cup seals, gaskets, U-rings, V-rings, Y-rings, back-up rings, etc.2) Custom design rubber parts3) Materials include: silicone rubber, nitrile rubber ... , EPDM, neoprene rubber, viton DuPont & Dow elastomers, natural rubber, SBR, fluorosilicone, ...