John Guest Acetal Copolymer Tube Fitting, Stem Adaptor, 1/4" Stem OD x 1/8" NPTF Male (Pack of 10) Stem adapter connects pipes or fittings of different types in a straight line Stem on one end and NPTF male on the other end connects two pipes or tubes with different ends 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