SMC KQ2 Series Polybutylene Terephthalate Push-to-Connect Tube Fitting, Reducer Nipple, 3/8" x 1/2" Tube OD, White, 50mm Length Reducer nipple for connecting two pipes or fittings with different diameters Accepts nylon and polyurethane tube fittings Made of polybutylene terephthalate (PBT) for resistance to solvents, shrinkage, heat, and impact Working pressure of up to 145 psi Operating temperature ranges from -5 to 60 degrees C This product is not intended for use in potable water systems