John Guest Acetal Copolymer Tube Fitting, Straight Adaptor, 3/8" Tube OD x 3/8" NPTF Male (Pack of 10) Straight adapter connects pipes or fittings of different types in a straight line Push-to-connect fitting connects to pipes or tubing on one end and has an NPTF male connector on the other Made of acetal copolymer plastic for low moisture absorption and high tensile and flexural strength Working pressure of up to 150 psi Meets NSF/ANSI standards 14, 51, and 61 for quality assurance