The R-12P Relay Valve is a practical and efficient replacement for the Bendix R-12P Relay Valve, featuring a vertical mount and 2 port delivery located on the side of the valve. With supply and delivery ports of (2) 1/2" PT and (2) 3/8" PT, as well as a control port of 1/4" PT and a crack pressure of 4.0 PSI, this valve is designed to fit most makes and models. Sold individually, this reliable and durable valve is a cost-effective solution for your vehicle's air brake system.