... rubber O ring),-- Suit medium: cold water, hot water, compressed air, gas, oil etcSealing ring material:Option 1. CIIR(Chlorinated butyl ... water, tap water, hot and cold water, sanitary air and compressed gas. Option 2. EPDM(Ethylene-Propylene-Diene Monomer) : Sanitary for ... water, tap water, hot and cold water, sanitary air and compressed gas. Option 3: Nitrile rubber: oil proof, but not sanitary ...