EVIL ENERGY 6AN Male to 3/8" Quick-Disconnect Female Adapter — 2-Pack, 6061-T6 Aluminum, 1500 PSI

EVIL ENERGY's 6AN male to 3/8" quick-disconnect female push-on fitting (2-pack) adapts a 6AN threaded line to a 3/8" spring-lock hose for fast, leak-resistant connections.

This compact adaptor couples a 6AN (9/16-18UNF) flare-style male thread with a 3/8" quick-disconnect female spring-lock, designed for fuel and fluid systems where fast assembly and secure sealing matter. Machined from 6061-T6 aluminum with a 37° sealing flare, the fitting withstands typical automotive fluid pressures and temperature swings while fitting neatly into engine bays, fuel rails, transmission coolers, and return lines.

How does this fitting prevent leaks in fuel and fluid lines?

The fitting uses a 37° flare sealing surface matched to the 6AN male thread to create a metal-to-metal seal that resists seepage under pressure. The quick-disconnect female accepts a 3/8" spring-lock hose end to keep the hose secured without clamps, reducing leak points when installed correctly.

• 37° flare sealing geometry for metal-to-metal contact
• Thread size: 6AN (9/16-18UNF) to match standard AN lines
• Spring-lock female accepts 3/8" ID quick-disconnect hoses
• Proper torque and hose insertion needed for leak-free performance

What operating conditions and pressures can it handle?

Built to work in common automotive environments, the adaptor is rated to 1500 psi and performs across a broad temperature range, making it suitable for many fuel and transmission applications. While robust, it should be used within its specified limits and inspected regularly for wear when exposed to high heat or abrasive fluids.

• Working pressure: up to 1500 psi
• Temperature range: -40°F to 176°F
• Designed for automotive fuel rails, return lines, and cooler connections
• Not intended for pressures or temperatures beyond listed specifications

What materials and construction ensure durability?

The main body is machined from aircraft-grade 6061-T6 aluminum for a strong, lightweight connection that resists corrosion and handles vibration. The disconnect spring-lock component is made of durable plastic designed to engage securely with 3/8" quick-disconnect hoses while keeping the overall adaptor lightweight.

• 6061-T6 aluminum body for strength and corrosion resistance
• Plastic spring-lock insert for secure push-on hose retention
• Precision-machined threads and flare seat for consistent sealing
• Sold as a convenient 2-piece set for spare or dual-line use

How easy is it to install and where is it commonly used?

Installation is straightforward for anyone familiar with AN fittings and quick-disconnect hoses: thread the 6AN male into the matching flare port and push the 3/8" hose into the spring-lock until it seats. It’s commonly used on engine fuel rails, LS swaps, transmission coolers, fuel return lines, and aftermarket sensors where adapting AN fittings to push-on hoses is required.

• Thread into a 6AN/37° flare port and hand- or torque-tighten as required
• Push 3/8" spring-lock hose fully into the female end until it locks
• Used for fuel rails, return lines, transmission coolers, sensors, and swaps
• Two-pack gives a spare or allows dual installations

Who is this for? This adaptor set is aimed at automotive hobbyists, mechanics, and performance fabricators who need a reliable way to connect AN-threaded fittings to 3/8" quick-disconnect hoses. It’s useful for LS-swap builds, aftermarket fuel systems, transmission cooler plumbing, and anyone seeking a compact, lightweight adapter rated for typical automotive pressures and temperatures.