John Guest quick connect fittings for sanitary systems. Push-fit fastening system with Stainless Steel tweezers fitted for witholding the tubing and an O-ring fitted for ensuring a perfect seal. Operating temperature and pressure: Cold water supply: standard temperature from 1° to 20°. Maximum pressure 12 bar. Hot water supply: standard temperature 65° - 95° max. Maximum pressure 6 bar. The spigoted threaded terminal is inserted into a connecting elbow, into a T fitting or into a straight fitting when a threaded fitting is needed.