Usage Tips:Fitment: for and for all 1978-1987 full size trucks, with disc brakes in front and drum brakes in rear.2WD and 4WD, 1/2 ton, 3/4 ton, 1 tonEven P30 chassis frame.Features:This brake valve is a 5 port valve and can be left, right or bottom mounted.Valve has 9/16inch-18 ported rear brakes and dual 3/8inch-24 ported front brakes.Connections from the master cylinder are 1/2inch-20 and 7/16inch-24.Material: High quality aluminum alloy material, wear resistant, sturdy and durable.Quality: Professional manufacturing, stable performance, has a long service life.Name:Brake Proportioning Valve Model Number:Disc Drum brakes Proportioning Valve Size Chart:17cm/6.69inchType: Disc Drum brakes Proportioning Valve Colour:As Shown Material:copper Package Contents: 1 x Brake Proportioning Valve Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.