... welding or bolting, can be widely used in cold and hot water supply, heating supply, fire protection, medicinal gas, industrial petroleum ... (with Chlorinated butyl rubber O ring),-- Suit medium: cold water, hot water, compressed air, gas, oil etcSealing ring material:Option 1 ... , Press fitting introduction and e-catalogue from this link: http://www.hwsspfp.com/en/download.asp Male threaded coupling