Pv2 Brass Disc/Drum Disc Front Drum Rear Bake Proportioning - Fits most vehicles with dual reservoir master cylinders. Compatible with classic Chevrolet and Buick cars and trucks. Standard brake hose connections: 1/2‘ front disc brake and 7/16’ rear drum brake. Durability: The valve is made in solid brass for heavy duty and long lasting feature, ensures long-lasting durability of GM brake valves. Brake Proportioning Valve Replacement part: 172-1353 Package Includes:PV2 Brass Proportional Valve*1,Connector*1 Warranty period: 2 years 1