15231-413-020 Relief Valve - Overview. The 15231-413-020 Relief Valve is a critical component for Honda marine engine systems designed to regulate and release excess pressure within the hydraulic or oil pump systems. This valve helps prevent damage to the engine by maintaining optimal pressure levels, ensuring smooth and safe operation. Made to strict OEM standards, it integrates seamlessly with existing engine parts, maintaining Honda's hallmark reliability and durability.. Key Features. Regulates and releases excess pressure to protect engine components.. Genuine Honda OEM part, ensuring perfect fit and factory specifications.. Designed to meet exact dimensions and tolerances for smooth integration.. Enhances system safety by automatically opening at predetermined pressure limits.. Contributes to hydraulic and oil pump system performance and longevity.. Manufactured with precision for consistent reliability in marine environments.. Why Choose Genuine OEM. Using original Honda parts l