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

EVIL ENERGY 6AN Male Non-Return One Way Inline Check Valve is a diaphragm-style inline fitting that permits flow in one direction while preventing backflow, built from 6061-T6 aluminum with a stainless-steel spring and black anodized finish.

This compact check valve is designed for use in automotive and small-engine fluid systems where a reliable, low-opening-pressure one-way device is needed. With male 6AN (9/16"-18 UNF) threads, a 3 PSI opening threshold and a maximum rated pressure of 150 PSI, it can be used with fuels, oils, coolants and gases where directional control of fluid is required. The valve’s diaphragm design and internal spring deliver predictable operation while the aluminum construction and anodized surface help resist corrosion and wear.

How does this valve control flow without leaking back?

The internal diaphragm seals against reverse flow until forward pressure exceeds the calibrated spring force. When system pressure reaches about 3 PSI the diaphragm lifts, allowing fluid to pass; when pressure drops or reverses the spring returns the diaphragm to its seat to stop backflow.

• Diaphragm-style sealing for tight closure under reverse pressure
• Stainless-steel spring provides consistent opening tension
• 3 PSI opening pressure tuned for low-pressure systems
• 150 PSI maximum working pressure for higher-pressure tolerance

What fittings and systems is the valve compatible with?

The valve uses male 6AN (9/16"-18 UNF) threads on both inlet and outlet, making it a direct fit for standard AN hose ends and adapters. It’s suitable for many fluid types found in performance and maintenance applications.

• Male 6AN thread size for AN hose and adapter compatibility
• Accepts fuels including gasoline, diesel, methanol, ethanol, and E85
• Works with oils, coolants and compressed air/gas lines
• Inline form factor for easy insertion into existing hose runs

What materials and durability features does the valve offer?

The body is machined from 6061-T6 aluminum and finished with a black anodized coating to reduce surface wear and corrosion. Internal components include a stainless-steel spring and a precision diaphragm chosen for chemical compatibility and long service life.

• 6061-T6 aluminium body for strength with reduced weight
• Black anodized surface improves corrosion and abrasion resistance
• Stainless-steel spring for reliable, repeatable actuation
• Diaphragm construction suited to multiple fluid chemistries

How should I install and maintain this inline check valve?

Install the valve inline with the arrow or flow direction pointing downstream; use proper AN fittings or adaptors for leak-free connections. Periodic inspection and cleaning are recommended when used with contaminated fluids or in harsh environments to maintain reliable operation.

• Fit with male 6AN hose ends or adapters; ensure correct flow orientation
• Use thread sealant or PTFE tape on compatible fittings where needed
• Inspect for debris and test operation after installation
• Replace if diaphragm shows wear or spring tension changes

Who this is for: The EVIL ENERGY 6AN Male Non-Return One Way Inline Check Valve is aimed at automotive enthusiasts, race teams, and technicians who need a compact, low-opening-pressure one-way valve for fuel systems, oil circuits, coolant lines or pneumatics. It suits anyone installing or upgrading AN-style hose assemblies who requires reliable backflow prevention and corrosion-resistant construction in a small, inline package.