... , 32, 40, 50, 65, 80 and DN100, including GB 1 and GB 2.GB 1 series is same size ... Suit medium: cold water, hot water, compressed air, gas, oil etcSealing ring material:Option 1. CIIR ... for drinking water, tap water, hot and cold water, sanitary air and compressed gas. Option 2. EPDM(Ethylene- ... for drinking water, tap water, hot and cold water, sanitary air and compressed gas. Option 3: Nitrile rubber: ...