6AN ML to 1/4in NPT ML 1/8in NPT Hex Black

The 6AN ML to 1/4in NPT ML 1/8in NPT Hex Black adapter from REDHORSE PERFORMANCE is an essential fitting for custom fuel system builds, boost distribution lines, and engine management plumbing where mixed port standards must interface seamlessly. This multi-port adapter solves a common real-world problem: connecting high-flow -6AN hose assemblies to metric and NPT threaded components on fuel rails, regulators, and boost controllers without compromising flow rate or introducing leaks. Whether you're building a turbocharged direct injection platform or retrofitting an aftermarket fuel system, this adapter eliminates the need for multiple separate fittings.

REDHORSE PERFORMANCE machined this adapter from aluminum or steel with hard-anodized black finish for durability under engine bay temperature swings and fuel system pressure cycles. The hex body design allows wrench-friendly installation in tight spaces, critical when working around manifolds and turbo inlets. The dual-port configuration—1/4 inch NPT male on one end and 1/8 inch NPT male on the other—lets you branch pressure or return lines to multiple system components with a single compact fitting. The -6AN AN male inlet accommodates standard braided stainless or PTFE-lined hose assemblies, maintaining excellent flow characteristics at 100+ PSI boost systems or high-volume carbureted applications.

This adapter is ideal for fuel-system builders, turbo installers, and engine builders who demand flexibility in port sizing without sacrificing structural integrity or introducing flow restrictions. It pairs well with custom fuel rails, aftermarket regulators, and boost-reference fittings where OEM hose diameters don't match available gauge ports. Installation requires a wrench or adjustable spanner on the hex body and thread sealant (PTFE tape or liquid) on NPT ports to prevent weeping. Compatible with gasoline, diesel, and boost circuits—always verify pressure rating and fluid compatibility with your specific application before final assembly.