O-ring in NBR,EPDM,Silicone,Viton Shore60,70,80,90 ... ,FDA,WRAS,TZW,W270,UL AS568,P.G.etc. ItemRubber O-ring DescriptionDescriptionWidely used in bathroom product, valve, faucet, machine, hydraumatic ... meet PAHS,NP requirement.NBR,EPDM,FKM,ACM,IIR,Silicon rubber etc. are available.Material usage is based on the final ...