Tefen Acetal Compression Tube Fitting, Adapter, Black, 3/8" Tube OD x 1/4" BSPT Male (Pack of 5) Adapter for connecting pipes or fittings of different types Push-to-connect fitting connects to pipes or tubing on one end and has a BSPT 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 200 psi Operating temperature ranges from -4 to 194 degrees F