... Water Heater Rubber Parts 2.RoHS;ISO9001certification 3.100%silicone 4.Nontoxic, antioxidative 5.Size:20.47.58mm Products ... feature1,made of 100% silicone material 2,nontoxic, odorless, non-corrosive ,antioxidative3,Each ... life10--15 yearsCustomizedUnilateral or bilateral according to your requirements hot sell silicone accessories O sealing loop used for solor water heater