water tube black o ring ShoreA50,60,70,80,90 black,white, ... ,blue NSF,FDA,WRAS,TZW,W270,UL Lead time15days Itemwater tube black o ringDescriptionMaterial:NBR,EPDM,FKM,ACM,IIR,SiliconShoreA50,60 ... ,blueNSF,FDA,WRAS,TZW,W270,ULAS568,P.G.etc.AdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali resistance ...