EVIL ENERGY 6AN Male Inline Check Valve — Black Diaphragm Design, 3 PSI Opening, 150 PSI Rated

EVIL ENERGY's 6AN male diaphragm inline check valve is a compact, black-anodized aluminum fitting that allows one-direction flow and prevents backflow in fuel, oil, coolant and air systems.

This one-way 6AN inline check valve uses a diaphragm-style design with a stainless steel spring and a 3 PSI opening pressure to reliably control flow direction. Machined from 6061-T6 aluminum and finished with black anodizing, the fitting balances light weight and corrosion resistance for motorsport, racing, and performance plumbing needs. Rated to a maximum of 150 PSI, it suits a range of medium types including gasoline, diesel, methanol, ethanol (E85), oil, coolant and compressed air.

How does the diaphragm-style design keep fluids flowing the right way?

The diaphragm mechanism combined with a stainless steel spring opens at about 3 PSI and seats closed to block reverse flow. This arrangement reduces wear compared with poppet-style valves and provides a predictable, low cracking pressure for sensitive systems.

• Diaphragm seating prevents pulsation-induced leakage.
• Stainless steel spring ensures consistent opening and closing force.
• 3 PSI opening pressure for low-resistance flow start-up.
• One-way action stops backflow that could contaminate or flood components.

What fittings and pressures does this 6AN check valve support?

The valve has male 6AN threads (9/16"-18 UNF) on both inlet and outlet to integrate directly with common AN hose ends and adapters. It’s rated to handle up to 150 PSI maximum system pressure, making it suitable for many fuel and fluid applications in automotive and industrial settings.

• Male inlet/outlet: 6AN (9/16"-18 UNF) for standard AN plumbing.
• Opening pressure: approximately 3 PSI for low-threshold activation.
• Maximum working pressure: 150 PSI for robust operation.
• Compact inline form factor for tight installation spaces.

Which fluids and environments is this check valve compatible with?

Constructed from 6061-T6 aluminum with a black anodized finish and internal stainless steel spring, the valve is designed for various liquid and gaseous media commonly used in performance systems. It is appropriate for fuel, oil, coolant and air applications where a modest maximum pressure and low opening force are needed.

• Suitable for gasoline, diesel, methanol, ethanol (E85), and blends.
• Compatible with engine oil, coolant, and compressed air lines.
• Black anodize improves corrosion and wear resistance in harsh environments.
• Not intended for high-temperature steam or aggressive chemical service without validation.

How do I install and maintain the EVIL ENERGY 6AN check valve?

Installation is straightforward: thread the male 6AN fittings into matching female AN hose ends or adapters and torque to recommended AN specifications. Periodic inspection for leaks and spring/diaphragm integrity keeps operation reliable; replace if damaged or if cracking pressure drifts from the specified value.

• Use correct AN wrenches to avoid scratching the anodized surface.
• Apply proper sealing method for AN connections (flare fittings typically seal metal-to-metal).
• Check for leaks after initial run and after thermal cycles.
• Replace valve if diaphragm shows wear, deformation, or inconsistent cracking pressure.

Who is this for: The EVIL ENERGY 6AN Male Non-Return One-Way Inline Check Valve is aimed at mechanics, tuners and racing enthusiasts who need a compact, low-cracking-pressure check valve for fuel, oil, coolant or air systems. It’s a suitable choice for performance builds, retrofit plumbing on race cars, motorcycles, marine engines and industrial equipment where AN-standard fittings and predictable one-way flow control are required. If you need a simple, durable inline valve with a 6AN interface and a 3 PSI opening threshold, this product delivers a practical balance of weight, corrosion resistance and pressure capability.