EVIL ENERGY 6AN Male to 3/8-Inch Hardline Compression Fitting Adapter – 2PCS

Important: The 3/8-inch measurement refers to the hardline’s outside diameter, not its inside diameter or the nominal AN hose size.

Aluminum Alloy Body with Brass Compression Ferrule

Each EVIL ENERGY adapter uses an aluminum alloy fitting body paired with a brass compression ferrule.

The compression ferrule is designed to grip and seal against the exterior surface of the hardline when assembled correctly.

This construction offers a convenient alternative to certain flared tubing connections, provided the hardline material, dimensions, surface condition, and operating pressure are suitable.

The fitting is intended only for compatible stainless steel or aluminum hardlines, according to the supplied manufacturer specifications.

Why the Hardline Material Matters

Compression fittings depend on the tubing’s outside diameter, hardness, surface condition, and wall thickness.

A fitting that works correctly on one type of metal tubing may not be suitable for another.

Do not assume compatibility with copper, plastic, rubber, nylon, or coated factory fuel tubing.

Precision 37-Degree AN Flare Connection

The male -6AN connection uses a 37-degree flare sealing surface.

Unlike NPT pipe fittings, AN connections seal at the flare rather than through the threads.

The threads provide the clamping force necessary to bring the mating flare surfaces together.

For a proper seal, connect the fitting to a compatible female -6AN flare connection and inspect both sealing surfaces for damage.

Do not use PTFE tape or pipe-thread sealant on the AN flare threads.

Ideal for Fuel System Upgrades and Engine Swaps

These EVIL ENERGY adapters are useful in custom automotive plumbing projects where an existing metal fuel line must connect to aftermarket AN components.

Common applications include:

• Converting compatible metal fuel lines to braided AN hose

• Aftermarket fuel rail installations

• Fuel pressure regulator upgrades

• LS engine swap fuel plumbing

• Custom fuel supply and return line connections

• Modified gasoline fuel systems

• Performance engine builds

• Custom hardline repairs and modifications, where approved

For more information about fuel line sizing and installation, read our How to Convert to E85 – Upgrading Fuel Lines guide.

The article discusses fuel line materials, aftermarket hose routing, and considerations when upgrading fuel delivery systems.

EVIL ENERGY 6AN to 3/8-Inch Compression Fitting Specifications

The supplied product specifications do not establish a maximum pressure rating, temperature rating, or E85 compatibility. Confirm these details before installation.

What Vehicles Do These EVIL ENERGY 6AN Compression Adapters Fit?

These fittings are universal automotive plumbing adapters rather than direct-fit OEM replacement parts.

They may be used on vehicles with compatible 3/8-inch OD stainless steel or aluminum hardlines and aftermarket -6AN fuel connections.

Fitment warning: These are potential custom applications, not confirmed direct-fit vehicle applications. Factory fuel lines may have different diameters, coatings, materials, or quick-connect ends.

Measure the actual outside diameter of the tubing before purchasing.

How to Install a 6AN to 3/8-Inch Hardline Compression Adapter

1. Relieve fuel system pressure and disconnect the battery before beginning work.

2. Confirm the hardline is 3/8-inch OD and made from an approved stainless steel or aluminum tubing material.

3. Inspect the hardline for corrosion, dents, scratches, deformation, or unsuitable coatings.

4. Cut the tubing squarely using a suitable tubing cutter.

5. Deburr and clean the cut end without reducing or damaging the sealing surface.

6. Install the compression nut and brass ferrule in the correct orientation.

7. Insert the tubing fully into the adapter body.

8. Tighten the compression fitting according to EVIL ENERGY’s instructions.

9. Connect the male -6AN flare to a compatible female AN fitting.

10. Secure the hardline and connected hose to prevent vibration and mechanical stress.

11. Pressure-test the completed connection and inspect for leaks before operating the vehicle.

Important Installation Precautions

• Do not use the adapter on unsupported tubing materials.

• Do not install the ferrule over damaged or heavily corroded hardline.

• Do not assume a previously compressed ferrule can be reused.

• Do not overtighten the aluminum fitting body.

• Do not apply thread sealant to the AN flare connection.

• Do not use the fitting in brake or other safety-critical hydraulic systems without explicit manufacturer approval.

For high-pressure fuel systems, verify that the complete adapter assembly is rated for the actual operating pressure.

6AN Compression Adapter vs. AN Flare Adapter

The compression design can simplify certain installations, but suitability depends on tubing specifications and the fitting’s approved operating conditions.

Buy EVIL ENERGY 6AN Male to 3/8-Inch Hardline Compression Adapters at Pro Street Online

Complete your custom fuel plumbing project with the EVIL ENERGY 6AN Male to 3/8-Inch Hardline Compression Fitting Adapter 2-Pack.

Featuring aluminum alloy construction, brass compression ferrules, 37-degree AN flare sealing, and compatibility with appropriately sized metal tubing, these fittings provide a convenient solution for connecting compatible rigid fuel lines to aftermarket AN plumbing.

Shop fuel line adapters, braided hoses, and performance fuel system components at Pro Street Online