SMC KQ Series Brass Push-to-Connect Tube Fitting, Straight Union, 5/16" Tube OD, Black Straight union for connecting and disconnecting two inline pipes more easily than couplings Accepts nylon and polyurethane tube fittings Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability 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