Feature 1Function: By reducing the brake pressure on the rear brake, the proportioning valve can easily adjust the front to rear brake bias, knob design, easy to use. 2Ports: Includes ports are 1/827 NPT, and port adaptor for 3/8 inverted flare brake line nuts. Please check the size before purchase. 3Improved Braking Effect: It can be adjusted according to individual driving needs and different road conditions to provide the best braking effect for vehicles with different purposes 4Durable Aluminum: Made of aluminum, the brake bias valve has a reliable design and excellent manufacturing quality to ensure long lifespan and reliability. 5Wide Compatibility: Adjustable brake bias valves accommodate a wide range of vehicle models, fit a wide range of braking systems, and are easy to install.Item Type: BrakeProportioningValveMaterial: AluminumSpecification: 100-1000PSIMaximum Pressure Reduction: 57%Ports: 1/8-27 NPT .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x BrakeProportioningValveNoteMake sure the valve does not rub against any other brake lines or make contact with the hood for better overall braking performance.