12V Diesel Fuel Transfer Pump for Cars Caravans Boats Marine Water Oil Pump Features： 1、High precision anodized aluminum valve body finished in gun metal. 2、Built-in spring prevents premature high thrust action. 3、Adjustable spring tension to handle different levels of thrust. 4、Return pipe can be used to prevent venting to atmosphere. 5、25mm port, universal design. Made by professional supplier, quality assurance. Specification： Blow Off Valves are eliminate compressor and preventing premature boost leakage, while increasing boost response between shifts. Each valve is made of billet aluminum frame and provides performance that cheap piston types cannot offer. Features: High precision aluminium valve body finished in anodised gun metal. Built-in spring prevents premature action under high boost. Adjustable spring tension to handle different boost levels. Return pipe can be used to prevent venting to atmosphere. 25mm port, universal design. Made by professional manufacturer, quality assurance. Specifications: Material: aluminium Color: black, rose red (optional) Port size: 25mm (please check on our pictures) Fit: universal Package size: 14 * 11 * 5.5cm / 5.5 * 4.3 * 2.2in Package weight: 196g / 7oz Package list: 1 * Turbo Blow Off Valve Package List： 1 * Turbo Blow Off Valve