... water supply, heating supply, fire protection, medicinal gas, industrial petroleum pipeline system etc. It has already replaced welding fittings in most ... O ring),-- Suit medium: cold water, hot water, compressed air, gas, oil etcSealing ring material:Option 1. CIIR(Chlorinated ... drinking water, tap water, hot and cold water, sanitary air and compressed gas. Option 2. EPDM(Ethylene-Propylene-Diene ...