Precision 37-Degree AN Flare Sealing
EVIL ENERGY uses standard 37-degree AN flare geometry for the male connections.
Unlike tapered pipe threads, AN flare fittings seal at the mating flare surfaces rather than through the threads themselves.
The 9/16-18 UNF threads provide the mechanical clamping force needed to seat the mating 37-degree sealing surfaces.
When properly installed with compatible female AN fittings, this design creates a secure connection without requiring PTFE tape or thread sealant.
Installation reminder: Never apply thread sealant or PTFE tape to the 37-degree AN flare connections. Inspect the sealing surfaces for scratches, debris, and damage before assembly.
Built from 6061-T6 Aluminum Alloy
The EVIL ENERGY 6AN couplers are manufactured from 6061-T6 aluminum, a material widely used in automotive performance fittings because of its favorable strength-to-weight ratio and corrosion resistance.
These aluminum unions are well suited for custom fuel and fluid plumbing where weight, compact packaging, and serviceability are important considerations.
The fittings are designed for applications operating within the stated temperature and pressure limits.
Ideal for Fuel System Upgrades and E85 Conversions
Custom fuel systems often require additional connections when installing upgraded pumps, aftermarket fuel filters, regulators, and braided hose assemblies.
These EVIL ENERGY 6AN male flare unions can simplify plumbing changes by connecting compatible female AN fittings.
Typical applications include:
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Custom gasoline fuel supply and return lines
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Aftermarket fuel pump plumbing
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E85 fuel system builds, subject to complete system compatibility
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LS engine swap fuel systems
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Turbocharged and supercharged engine builds
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Fuel pressure regulator connections
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Compatible oil cooler and fluid transfer lines
When building an ethanol-compatible fuel system, verify the chemical compatibility of every hose, seal, adapter, and component exposed to fuel.
Learn more about the requirements of an ethanol conversion in our How to Convert to E85 technical guide.
EVIL ENERGY 6AN Male-to-Male Coupler Specifications
| Specification | Details |
|---|---|
| Brand | EVIL ENERGY |
| Product type | Straight Flare Coupler Union |
| Package quantity | 2 fittings |
| Connection A | -6AN male |
| Connection B | -6AN male |
| Thread specification | 9/16-18 UNF |
| Sealing geometry | 37-degree AN flare |
| Material | 6061-T6 aluminum alloy |
| Maximum advertised working pressure | 1,500 PSI |
| Working temperature | -40°F to 250°F |
| Installation type | Universal |
| Primary uses | Fuel line extensions, AN plumbing, compatible cooler lines |
What Vehicles Does This EVIL ENERGY 6AN Coupler Fit?
This is a universal AN fitting, not a vehicle-specific replacement component.
It is suitable for custom applications using compatible female -6AN flare connections.
| Vehicle / Engine Platform | Typical Custom Application |
|---|---|
| Chevrolet Camaro / Corvette LS | Aftermarket fuel line extensions |
| Ford Mustang 5.0L Coyote | Custom fuel supply and return plumbing |
| Honda Civic / Acura Integra | Performance EFI fuel system upgrades |
| Nissan 240SX SR20DET / KA24 | Braided fuel hose connections |
| Toyota Supra 2JZ | Custom fuel system modifications |
| Lexus IS300 2JZ-GE | Aftermarket fuel line routing |
| Mitsubishi Lancer Evolution | Fuel system and cooler plumbing |
| Subaru WRX / STI | Modified fuel delivery installations |
Fitment note: These unions connect two compatible female -6AN flare fittings. They do not directly connect to factory rubber fuel hoses, OEM quick-connect fuel fittings, or NPT pipe threads without additional compatible adapters.
How to Install a 6AN Male-to-Male Flare Union
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Relieve fuel system pressure and disconnect the battery before working on fuel lines.
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Verify that both hose ends have compatible female -6AN 37-degree flare connections.
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Inspect the coupler and hose-end sealing surfaces for damage or contamination.
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Thread each female hose end onto the coupler by hand to prevent cross-threading.
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Tighten the connections according to the fitting manufacturers’ recommendations.
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Route and support the completed fuel line to prevent rubbing, vibration damage, or excessive tension.
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Prime and pressure-test the system, checking both connections for leaks before operating the vehicle.
Avoid using a union as a substitute for proper hose routing or support. Every additional connection introduces another potential leak point, so use couplers where they are genuinely needed.
EVIL ENERGY 6AN Coupler vs. Other AN Fittings
| Fitting Type | Primary Purpose |
|---|---|
| 6AN Male-to-Male Straight Union | Joins two female -6AN connections |
| 6AN Male-to-Female Adapter | Extends or repositions a compatible AN connection |
| 6AN 90-Degree Elbow | Changes fuel line routing direction |
| 6AN to NPT Adapter | Connects compatible AN plumbing to pipe-threaded ports |
| 6AN Fuel Pressure Take-Off | Adds a pressure gauge or sensor port |
Choosing the correct fitting helps reduce unnecessary adapters and simplifies the fuel system layout.
Buy EVIL ENERGY 6AN Male-to-Male Flare Couplers at Pro Street Online
Make your next custom fuel system installation easier with the EVIL ENERGY 6AN Male to 6AN Male Flare Coupler Union 2-Pack.
Featuring precision 37-degree flare connections, lightweight 6061-T6 aluminum construction, and a manufacturer-advertised 1,500 PSI working pressure, these straight AN6 unions are practical components for custom fuel lines, engine swaps, and compatible automotive fluid plumbing.
Shop performance fuel system components and AN fittings at Pro Street Online.
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