Colder NS6D17008 Polypropylene Tube Fitting, Coupler, Shutoff, In-Line, 3/8" Flow Coupler x 1/2"Barb Coupler for connecting tubing in a straight run Coupler on one end and barbed construction on the other end for connecting tubes with different ends Polypropylene for chemical resistance and dimensional stability Working pressure of up to 120 psi Operating temperature range from 32 - 160 degrees F