O-ring in NBR,HNBR,EPDM,Silicone,Viton,etc Hardness: ... yellow,blue,etc NSF,WRAS,TZW,W270,FDA ItemNBR O-ring DescriptionDescriptionWidely used in bathroom product, valve, faucet, machine ... and PFOS commands. Partial meet PAHS,NP requirement.NBR,EPDM,FKM,ACM,IIR,Silicon rubber etc. are ... .Packing Spec.Standard packing: a. plastic bag inside with barcode; b. carton outside.Not-standard packing: follow ...