EVIL ENERGY 6AN Male Inline Check Valve — Black Anodized 6061-T6 Aluminum, 3 PSI Crack/150 PSI Max

EVIL ENERGY's 6AN male inline check valve is a diaphragm-style, one-way fitting made from black-anodized 6061-T6 aluminum that permits flow at 3 PSI and prevents backflow up to 150 PSI.

This compact inline check valve is engineered for fuel-system and fluid-control use where reliable one-direction flow is required. The 6AN (9/16"-18 UNF) male inlet and outlet threads make it compatible with common AN hose assemblies, and the diaphragm design with a stainless-steel spring offers consistent opening pressure and rapid sealing to stop reverse flow. The black anodize improves corrosion and wear resistance for long service life in automotive, motorsport, marine, and industrial environments.

How does the diaphragm-style check valve control flow?

The valve uses a flexible diaphragm held by a stainless-steel spring to seal against reverse flow and to open when forward pressure reaches about 3 PSI. This arrangement minimizes leakage and provides a predictable cracking pressure so connected systems behave consistently. The diaphragm's movement is quick, which reduces pulsation and helps protect pumps and other components from reverse pressure.

• Diaphragm plus spring design yields a 3 PSI opening (cracking) pressure.
• Rapid closing prevents backflow when pressure drops or reverses.
• Consistent operation suitable for pumps, injectors, and return lines.

What materials and pressures can I expect from this fitting?

Manufactured from high-strength 6061-T6 aluminum and finished with black anodize, the valve resists corrosion and mechanical wear while remaining lightweight. The rated maximum working pressure is 150 PSI, which covers typical automotive fuel and coolant applications; still, always confirm compatibility with system requirements and media type before installation.

• Body: 6061-T6 aluminum for strength and low weight.
• Finish: black anodized surface for added corrosion resistance.
• Pressure range: opens at ~3 PSI, maximum rated 150 PSI.

Which fluids and systems is this check valve suitable for?

Designed for versatile use, the valve is compatible with a range of common media including gasoline, diesel, oil, coolant, air, methanol, ethanol, and E85 blends. Its construction and sealing method make it appropriate for fuel systems, return lines, vented lines, and other applications where one-way flow is needed. Avoid exposure to solvents or fluids outside manufacturer compatibility recommendations.

• Suitable for fuels: gasoline, diesel, E85, methanol, ethanol.
• Also compatible with oil, coolant, and compressed air service.
• Not recommended for unknown aggressive chemicals without testing.

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

Installation is straightforward: thread the male 6AN (9/16"-18 UNF) ends into corresponding AN female fittings or hose ends using proper sealing practices for AN fittings. Position so flow follows the valve's intended direction; confirm orientation stamps or markings before final tightening. Routine inspection for leaks, damaged threads, or degraded diaphragms will keep it functioning reliably.

• Use correct AN wrenches and avoid overtightening aluminum threads.
• Ensure flow direction matches the valve's orientation markings.
• Inspect periodically for leaks, corrosion, or spring/diaphragm wear.

Who this is for: installers, tuners, and fabricators who need a compact, reliable inline one-way valve for automotive, performance, marine, or light industrial fluid systems. It's aimed at users who require precise cracking pressure, corrosion-resistant materials, and compatibility with common fuels and fluids. If you need a lightweight, durable 6AN male inline check valve to prevent backflow in fuel lines, return circuits, or breather systems, this EVIL ENERGY fitting is a practical choice.