Why Use Hardline Compression AN Fittings?

Compression-style AN adapters allow builders to connect factory or custom hardline tubing directly to AN plumbing systems without extensive fabrication or welding. This creates a strong, serviceable connection while improving reliability and simplifying maintenance.

Translation: fewer leaks and slightly less swearing during installation.

install AN fittings like this on our DIY article

Features

• 6AN female flare fitting
• Compatible with 3/8-inch hardline tubing
• Compression-style hardline connection
• Lightweight billet aluminum construction
• Black anodized corrosion-resistant finish
• Precision CNC-machined sealing surfaces
• Leak-resistant AN flare design
• Includes 2 fittings per kit
• Suitable for fuel, oil, coolant, and transmission systems

Size: 6AN feminine to a few/8 inch, the thread size of the 6 AN is nine/16 UNF. Fits to a few/8″ OD hardline, please measure before purchase. You can convert to E85 using this kit which employs compression fittings.

Common Applications

• EFI fuel system conversions
• Return-style fuel setups
• LS swap plumbing
• Fuel hardline routing
• Oil cooler installations
• Transmission cooler systems
• Brake and clutch hydraulic setups
• Turbocharger fluid systems
• Custom AN plumbing projects

Subject material: Made from aluminium alloy fitting and brass ferrule.

Perfect for Modern Fuel Systems

AN plumbing systems provide better durability, serviceability, and fuel compatibility compared to aging factory rubber and plastic fuel lines. Pairing hardline tubing with AN fittings creates a cleaner and more professional fuel system layout for both street and motorsports applications.

Especially important when your fuel system now flows enough E85 to bankrupt an entire zip code.

Sealing: The AN thread of the flare is sealed by a 37 degree angle.

Compact and Durable Design

The compact billet aluminum construction allows easier installation in tight engine bays and underbody routing areas while maintaining excellent corrosion resistance against fuel, oil, brake fluid, and harsh environmental exposure.

Because rust and fluid leaks are terrible additions to a clean engine bay.

Application:This 3/8 compression to 6an fitting is widely utilized in fuel delivery, fuel system, engine amendment, and the like.

Great for Custom Fabrication Projects

Whether you’re routing fuel lines through a shaved engine bay, fabricating transmission cooler lines, or building a full race fuel system, these compression adapters help simplify hardline integration while maintaining a clean professional appearance.

Basically ideal for enthusiasts who enjoy turning “simple upgrades” into full weekend engineering projects.

Note: Most effective applicable to chrome steel or aluminum hardline.

Why Choose EVIL ENERGY?

EVIL ENERGY has become a trusted choice for affordable performance plumbing hardware, AN fittings, and custom fuel system components. Their hardline compression fittings offer reliable sealing performance, durable construction, and universal compatibility for both street and track applications.

Because fluid leaks should never become part of your tuning strategy.