12AN Female to 16AN Male Expander Black

The 12AN Female to 16AN Male Expander Black by REDHORSE PERFORMANCE is a precision hydraulic fitting adapter designed for builders and mechanics who need to step up hose line sizes in tight underhood packaging or fuel system configurations. This expander fitting solves a critical plumbing problem: connecting smaller-diameter supply or return lines to larger-diameter system components without compromising flow integrity or requiring custom fabrication. Whether you're building a high-flow fuel system, upgrading cooling circuits, or routing brake fluid in a custom chassis, this adapter provides a reliable, code-compliant transition that maintains system pressure and eliminates leaks at the connection point.

Engineered from aerospace-grade materials, the 12AN to 16AN expander features a black-anodized aluminum body that resists corrosion and integrates seamlessly into modern performance plumbing schemes. The female port accepts standard 12AN hose assemblies (1.75-inch outer diameter), while the male port delivers a full 16AN connection (2.25-inch outer diameter), eliminating stepped transitions and bottlenecks. REDHORSE PERFORMANCE's design ensures that internal passages are precisely bored to ISO 4401 standards, maintaining laminar flow characteristics even under sustained pressure cycling, which is critical for fuel injection systems running above 100 psi or cooling systems experiencing rapid thermal cycling. The compact 3.825-inch length allows installation in space-constrained engine bays without adding bulk or requiring additional support brackets.

This expander is ideal for EFI conversions, supercharger installations, and custom cooling loops where OEM hard-line routing must be adapted to modern high-flow components. Professional fabricators and serious enthusiasts rely on REDHORSE expanders to eliminate field-improvised solutions and ensure that system reliability matches component quality. The 12AN Female to 16AN Male Expander Black is compatible with any hose standard that accepts AN fittings—SAE J518 Code 61, ISO 1453, or equivalent—making it a universal solution for street rods, race cars, custom trucks, and marine applications. Installation requires only standard wrench techniques; simply thread into the female hose end and torque the male port to spec, ensuring a vibration-proof, pressure-tight seal every time.