EVIL ENERGY 6AN Male to 3/8" Quick-Disconnect Female Push-On Fitting — 6061-T6 Aluminum, 1,500 PSI

EVIL ENERGY's 6AN male to 3/8" quick-disconnect female push-on fitting is a single-piece, 6061-T6 aluminum connector that lets you join a 6AN threaded line to a 3/8" spring-lock fuel hose quickly and securely.

This compact adapter combines a 6AN (9/16-18 UNF) male flare with a 3/8" spring-lock female push-on interface sealed at a 37° angle. Designed for high-pressure vehicle fuel and transmission lines, it provides a space-saving connection for fuel rails, return lines, coolers, sensors, and LS-swap plumbing. The fitting is machined from aluminum alloy 6061-T6 with a plastic spring lock and is rated for up to 1,500 psi across a wide temperature range.

How does this fitting prevent leaks on high-pressure lines?

The adapter uses a standard 37° flare sealing surface on the 6AN side, which mates to the male flare to form a metal-to-metal seal. The spring-lock female end snaps onto a 3/8" hose end for a fast, tool-free connection while the flare face resists seepage under pressure.

• 37° flare sealing for metal-to-metal contact
• Thread size: 6AN (9/16-18 UNF) for compatibility
• Rated working pressure up to 1,500 psi
• Plastic spring lock for quick push-on engagement

Will this part fit my LS swap or fuel-rail setup?

Yes — the 6AN male thread and flare are commonly used in performance fuel systems, including LS swaps and aftermarket fuel rails. Confirm your hose or quick-disconnect receiver is the 3/8" spring-lock type before installation.

• Works with 6AN threaded flare fittings and adapters
• Compatible with 3/8" spring-lock fuel lines and receivers
• Common use cases: fuel rail, return line, fuel sensor, transmission cooler

What are the material and temperature limits for this adapter?

The body is precision-machined from 6061-T6 aluminum for strength and corrosion resistance, while the quick-disconnect spring lock is molded plastic for secure engagement. The specified operating range covers -40°F to 176°F, making it suitable for most automotive and motorsport environments.

• Body material: aluminum alloy 6061-T6
• Spring-lock component: durable plastic
• Temperature range: -40°F to 176°F
• Working pressure: up to 1,500 psi

How easy is installation and are any other parts included?

Installation is straightforward: thread the 6AN male into the mating flare union and push the 3/8" spring-lock hose onto the quick-disconnect end until it clicks. This sale includes a single connector only, so you'll need any mating hoses, clamps, or complementary fittings separately.

• Push-on spring lock for tool-free hose attachment
• Threaded 6AN male for secure flare connection
• Sold individually — additional hoses or adapters not included

Who is this for: This adapter is aimed at mechanics, tuners, and DIY enthusiasts modifying fuel systems, performing LS swaps, or assembling transmission cooler and sensor lines. If you need a compact, high-pressure transition between a 6AN flare and a 3/8" spring-lock fuel hose, and you already work with aftermarket AN plumbing, this fitting is a practical, machined-aluminum option.