3/8in NPT ML - 1/4in NPT FM Reducer Blue

The 3/8in NPT ML - 1/4in NPT FM Reducer Blue is a precision hydraulic and pneumatic adapter fitting engineered for custom vehicle fuel, coolant, and brake system modifications. Built by REDHORSE PERFORMANCE, this straight reducer bushing connects larger 3/8-inch male NPT ports to smaller 1/4-inch female NPT outlets, making it essential for fabricators and mechanics downsizing fluid line diameters during engine swaps, turbo installations, or custom cooling loop builds. Whether you're plumbing a modified engine bay or integrating aftermarket fuel delivery systems, this fitting maintains system integrity while accommodating non-standard port configurations.

Constructed from aluminum and finished in blue anodized coating, the 912 Series design resists corrosion in high-moisture engine compartments while the anodized layer provides visual identification within color-coded fluid systems. The NPT (National Pipe Taper) thread standard ensures a leak-free seal without additional sealant tape when properly torqued, critical for pressurized fuel and coolant circuits where failures can cause catastrophic engine damage. Weighing just 0.045 pounds with a compact footprint (2.84 x 1.1 x 4.42 inches), this adapter fits tight spaces typical of custom engine bay layouts without sacrificing flow characteristics or structural durability.

Professional mechanics and engine builders favor REDHORSE PERFORMANCE fittings for turbocharged, supercharged, and naturally aspirated performance builds where reliability under boost pressure is non-negotiable. This reducer is ideal for custom fuel rail fabrication, remote oil cooler setups, intercooler plumbing, and closed-loop coolant systems on street and track vehicles. Installation requires standard wrench tools; ensure NPT threads are clean and slightly torqued to prevent thread stripping while avoiding over-tightening aluminum bodies. Compatible with any hydraulic or pneumatic system using standard NPT port configurations, this fitting integrates seamlessly into both OEM-based modifications and ground-up custom builds.