The John Guest stem adapter makes connecting hose to Push-fit fittings quick and easy. Manufactured in gray acetal, these adapters are suitable for foodstuff and potable liquids. They are also suitable for air and inert gases therefore can be used for CO2 and nitrogen beverage gas lines, pneumatics, vacuum as well as other applications. Features: Push-fit Technology creates reliable, leak-free connections Stem easily inserts into JG Push-fit fittings to make a permanent swivel connector Compatible with plastic or copper OD sized tubing Connect, disconnect, and reconnect in seconds without tools Food Quality and suitable for potable liquids and pure water applications Can be used for air/pneumatic & vacuum applications Acetal body Made with lead free materials Working pressure and temperature:  Max. 150 psi at 68° F Max. 100 psi at 150° F JG gray acetal is suitable for both compressed air and water (buna-n seal).