Common Rail Fuel Plugs are designed to replace failing pressure relief valves in Dodge Cummins and Chevy Duramax fuel systems, ensuring optimal performance. These robust plugs seal in up to 30,000 psi of rail pressure, significantly enhancing engine starting and overall reliability. Engineered for high-performance applications, they offer a straightforward replacement for stock relief valves, making them essential for any performance-driven build. Note: Removing the fuel pressure relief valve can lead to fuel system damage, so installation should be done with care.