12AN Inlet 12AN Outlet 1 Way Check Valve Black

The 12AN Inlet 12AN Outlet 1 Way Check Valve Black from REDHORSE PERFORMANCE is an essential fluid-management component for custom fuel systems, nitrous oxide delivery circuits, and hydraulic brake applications in modified vehicles. This check valve ensures directional flow control, preventing backflow and pressure loss in high-performance fuel injection setups, forced-induction systems, and custom plumbing configurations. Whether you're building a twin-turbo fuel system, upgrading to a carbureted engine with mechanical fuel pumps, or installing a custom cooling loop, this valve protects your investment by maintaining system integrity and preventing fuel or fluid siphoning when the engine is shut down.

Built with precision engineering, the 12AN check valve features dual 12AN AN-style port connections—both inlet and outlet—allowing seamless integration into braided stainless steel fuel lines and custom plumbing harnesses. The one-way design incorporates a spring-loaded ball mechanism that permits flow in the intended direction while sealing against reverse flow, ideal for systems operating under elevated fuel pressure or boost conditions. The black anodized aluminum body resists corrosion, maintains structural rigidity, and provides a clean aesthetic in engine bay installations. Compact dimensions and lightweight construction (0.295 lbs) make it suitable for space-constrained engine bays without sacrificing durability or flow capacity.

Enthusiasts running high-pressure fuel systems, EFI conversions, or nitrous oxide kits benefit most from this valve's reliability in demanding applications. Proper orientation—with flow directed from inlet to outlet—ensures the check valve functions correctly in fuel feed lines, especially in vehicles with multiple fuel pumps or gravity-fed secondary systems. Compatible with standard -12AN hose fittings and bulkhead connectors, installation requires basic mechanical knowledge and a wrench set. This component is engineered to withstand sustained pressure cycles and temperature fluctuations typical of turbocharged and supercharged engines, making it a critical safeguard for any serious performance fuel system upgrade.