This brake proportioning valve is designed to reduce the brake pressure to an individual wheel or wheels. For use on cars where balance bars and dual master cylinders are not allowed. Its small aluminum body has 1/8” N.P.T. in and out ports. Includes 1/8” N.P.T. x 3/16 Inverted flare fittings. "WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm."