6AN 3/8NPT to 2AN 1/8NPT Male Female Reducer

The 6AN 3/8NPT to 2AN 1/8NPT Male Female Reducer by Redhorse Performance is a precision hydraulic adapter designed for custom fuel, coolant, and brake line routing in modified vehicles. This stepped reducer bridges two different AN (JIC) port sizes while accommodating NPT (National Pipe Thread) fittings on either end, making it essential for engine bay modifications where space constraints or existing component layouts demand flexible plumbing solutions. Whether you're upgrading fuel delivery systems, installing auxiliary cooling loops, or reconfiguring brake circuits in a race build, this reducer eliminates the need for multiple fittings and reduces potential leak points.

Redhorse Performance reducers are machined from aluminum or aluminum-compatible alloys with anodized finishes to resist corrosion in high-heat engine compartments. The male-to-female configuration allows seamless integration into existing line assemblies without additional adapters or manifold modifications. The 6AN inlet accommodates larger flow capacity hoses common in fuel rails and turbo cooling circuits, while the 2AN outlet steps down for precision metering or connection to smaller-diameter components. Proper thread-locking compound and careful torque application during installation prevent vibration-induced loosening and ensure leak-free operation under boost pressure or high-temperature conditions.

Turbocharged and supercharged engine builders, fuel system tuners, and fabricators working on custom cooling solutions benefit most from this adapter's compact design and dual-thread compatibility. It works with both standard hose-end fittings and hard-line NPT connections, making it versatile for OEM-to-custom conversions or complete ground-up system builds. Installation requires basic hand tools and knowledge of proper hose-end torque specifications; always verify thread compatibility with your existing fuel rail, cooling block, or brake proportioning valve before ordering to ensure seamless fitment and long-term reliability.