Material: Made of high quality materials, professional manufacturing, stable performance, long-term use.Wide range of applications: The valve is used to control the front and rear brake pressure deviation, suitable for all kinds of vehiclesPressure adjustments range 100-1000 PSI and provide for a maximum decrease of 57% in line pressure. This adjustment lets you fine tune the front to rear braking balance by proportionately decreasing the rear (or in some cases the front) brake line pressure. This can also be used to adjust individual front wheel braking in circle track applications.It comes with the 1/8inch pipe to 3/8-24 inverted flare fittings to connect to brake lines.The Adjustable Proportioning valve is typically used to decrease the pressure to the rear brakes. When converting to a dual master or disc brakes the rear drums require less pressure and this valve is put in the front to rear brake line to reduce the pressure to the rear brakes. It can also be used in the front brake lines to reduce pressure.The Residual Valve is typically used on the disc or drum brake lines, Disc hold 2 lbs and drum Holds 10 lbs of pressure. This valve is mounted in the brake line when the master cylinder is located below the floor or the calipers or valves are higher than the master cylinders. The function of the valve is to prevent the back flow of fluid to the master cylinder and keep a small amount of pressure in the line. These are used in modified cars and street rods and customs.The valve has pipe thread fitting in the ends that accepts the common 3/8-24 inverted flare brake line fitting.Colour: black + blue + redMaterial: metalPackage Contents:1 * Pressure Regulating Valve1 * Residual Valve(2LB)1 * Residual Valve (10LB)Only the above package content, other products are not included.Note: Light 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.