6an Ultra Pro Check Valve One-Way

The 6AN Ultra Pro Check Valve One-Way by EARLS is a precision fuel system component designed for serious engine builders and performance enthusiasts who require reliability in high-flow applications. This check valve is essential in fuel injection systems, carburetor feeds, and custom fuel delivery setups where backpressure and reverse flow can negatively impact engine performance or damage sensitive components.

Engineered to meet EARLS' high standards, the 6AN Ultra Pro Check Valve features a precision poppet design that opens easily under forward pressure while sealing instantly against reverse flow. This design maintains system integrity without restricting fuel delivery, making it suitable for high-volume fuel systems in supercharged, turbocharged, and naturally aspirated performance engines.

Ideal for fuel injection conversions and carbureted hot rods, this one-way check valve prevents fuel siphoning when the engine is off or during low-pressure conditions. Its compact design allows for easy integration into tight engine bays and complex fuel line routing, while the hardened internal components resist degradation from ethanol blends and modern fuel additives.