John Guest Acetal Copolymer Tube Fitting, Bulkhead Union, 1/2" Tube OD (Pack of 5) Reducing branch tee for connecting three pipes or fittings with different diameters in a main/branch configuration Accepts nylon and polyurethane tube fittings 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