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Why choose UTSAUTO Brass PV4 brake proportioning valve? This is a UNIVERSAL PV4 combination valve, Disc/Disc brake system combination valve?exact copy of original AC DELCO style proportioning-combination valve in brass. This PV4 combination-proportioning valve is based on the popular AC DELCO 172-1361(disc-disc) valve. Our proportioning valve will work as left mount, right mount or bottom mount.The combination/prop valve has five connections.It has a 9/16"-18 connection for Rear Brakes & Dual 3/8"-24 ports for the front brakes.The connections from the Master Cylinder are 1/2"-20 and 7/16"-24. If you receive an order that does not meet your expectations, please allow us the opportunity to fix the problem before leaving feedback or rating us. We want you to be happy with your purchase! Contact us via the Message Center. Thanks.