#10 x #12 Male Reducer Fitting Black

The #10 x #12 Male Reducer Fitting Black from FRAGOLA is a precision adapter designed for automotive fuel systems, hydraulic lines, and performance cooling applications where stepped hose sizing is required. This straight reducer fitting transitions from 12 AN (3/4") male connections down to 10 AN (5/8") male ports, making it essential for custom fuel rails, turbo intercooler plumbing, and modular engine bay layouts where space or OEM port sizing demands a compact transition. Whether you're upgrading a carbureted engine fuel system or fabricating custom hard lines for a forced-induction build, this fitting handles the job without compromise.

Machined from aluminum and finished in black anodize, the #10 x #12 Male Reducer Fitting delivers corrosion resistance and a clean appearance in modern engine bays while maintaining full flow integrity at pressure. The straight configuration eliminates flow turbulence and pressure loss compared to elbow adapters, critical when fuel delivery consistency or hydraulic response timing affects performance or safety. Black anodizing provides superior durability against vibration wear, fuel degradation, and temperature cycling common in high-performance applications, while the aluminum construction keeps weight minimal—just 0.07 lbs—without sacrificing structural integrity.

Mechanics and fabricators favor FRAGOLA reducers for fuel system retrofits on restorations, LS engine swaps into chassis not originally designed for that powerplant, and any application requiring flexible hose-to-hard-line transitions. This fitting works equally well in street rods, drag racing fuel systems, and road course cars where reliability under sustained pressure and temperature variation is non-negotiable. Install with appropriate AN-sized hose or hard-line tubing, use thread sealant rated for your fluid type (fuel, coolant, or hydraulic), and torque according to standard AN fitting specifications—typically 10–15 ft-lbs for aluminum fittings. Verify compatibility with your specific system pressure and fluid before ordering.