The hardened pressure adjusting screw ring for the Citroën 15CV is a crucial component for the proper functioning of the vehicle. This ring ensures a firm attachment and precise pressure regulation of the adjustment screw, which is essential for optimal performance of the engine compartment. Made of high-quality, hardened steel, it offers durability and longevity. Specifically designed for the Citroën 15CV, it guarantees perfect fit and easy installation, resulting in increased reliability and safety while driving.