The John Guest union makes connecting OD tubing sizes to female NPT threads quick and easy. Manufactured in polypropylene with food grade EDPM O-ring, these fittings were developed for the filtered pure water market. Features: Push-fit Technology creates reliable, leak-free connections Used to connect OD tubing sizes  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 Polypropylene body with EDPM O-ring Made with lead free materials Working pressure and temperature:   Max. 150 psi at 70° F Max. 60 psi at 140° F Note: Not suitable for compressed air and vacuum applicationsPolypropylene (PP) fittings are for water only. Material is too soft and seal is EPDM for compressed air applications.