Kibblewhite Compression Release Valve Designed with advanced engineering to combat hot start problems and lighten the load on starters and batteries, this product exemplifies cutting-edge design. Its innovative approach ensures smooth operation and enhances the longevity of engine components, making it a must-have for efficiency and reliability. Features: 5-7 Newtons of closing force resistance Custom molded knobs ensure they stay cool to the touch and are easy to operate Require an M10 x 1.00 threaded hole for installation Sold in pairs Made in the USA