... and any non-standard o-ring), washer, oil seal, cup seals,gaskets, U-rings, V-rings, Y-rings, ... back-up rings, etc.2) Custom design rubber parts3) NSF approved materials, potable water components4) Materials ... include: silicone rubber, nitrile rubber, EPDM, neoprene rubber, viton DuPont & Dow elastomers, natural rubber, SBR, fluorosilicone, acrylics5) Usual ...