Update your semi truck with an improved transfer of fluids, with the Wabco 1/2" NPTF PC Check Valve that ensures you're Ready for the Road Ahead. Thanks to its National Pipe Taper Fuel (NPTF) threads, this replacement valve is able to tightly fit onto pipes manufactured in the US, while simultaneously allowing the flow of fluids in a single direction. Built with a pressure-controlled design to optimize performance and safety standards. FleetPride is your First Click in Heavy Duty.