Aftermarket New Old Reproduction Stock Heater Water Control Valve for all 75-78 Vehicles listed below with or without A/C. Replaces OEM Part #’s 3879337 and 3846381 which were Supersceded to each other by Chrysler. These may look different to the Originals, but will Function the same. If your Original had a Screw Type Mounting Bracket, then use our Part # WV0004 instead. Valve is Normally Open and then Closed under Vacuum. 1/2″ Inlet and Outlet. Made by Stant.75-76 A-Bodys with A/C.75-78 B-Bodys Heater only without A/C.