silicone o rings AS568,P.G.et ShoreA50,60,70,80,90 black, ... ,blue NSF,FDA,WRAS,TZW,W270,UL Lead time15day Itemsilicone o rings L/T 15daysDescriptionMaterial: siliconeShoreA50,60,70,80,90black,white,red ... ,W270,ULAS568,P.G.etc.AdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali resistance, weather resistance, abrasion resistance, voltage ...