Reducer Adapter Fittings -12AN x -20AN

The Reducer Adapter Fittings -12AN x -20AN from Vibrant Performance are essential plumbing components for any high-performance fuel, coolant, or brake line system where stepped port sizing is required. These adapters solve a common challenge in custom automotive builds: connecting hose lines of different AN (Army-Navy) sizes without compromising flow integrity or introducing leaks. Whether you're upgrading a fuel system on a forced-induction engine, retrofitting a cooling circuit, or fabricating custom brake lines, reducer adapters allow you to maintain proper fitting compatibility across mismatched line sizes.

Constructed from precision-engineered aluminum or stainless steel, the -12AN x -20AN design features a 12 AN male inlet that reduces to a 20 AN female outlet, enabling seamless transition between larger and smaller diameter hoses. Vibrant Performance's reducer fittings are manufactured to strict tolerances to ensure leak-free sealing when paired with compatible hose ends and swaged fittings. The compact form factor—measuring 4.53 x 2.25 x 5.91 inches with a lightweight 0.26 lb profile—fits easily into tight engine bays and underbody routing scenarios. Thread pitch and port geometry are optimized for JIC or AN standard hose end compatibility, eliminating cross-threading issues and reducing installation time on demanding projects.

Mechanics and fabricators routinely specify these reducer adapters when piecing together custom fuel rails, intercooler piping, transmission cooler circuits, and brake distribution systems on both street and track vehicles. The -12AN inlet accommodates larger capacity feed lines from fuel pumps or radiators, while the -20AN outlet steps down to match existing component ports or smaller-diameter hose runs. Installation requires standard AN wrench sizes and basic familiarity with AN fitting torque specs—typically 18–22 ft-lbs depending on application. Verify your system's hose end types (straight, 45°, or 90° elbows) and confirm port orientation before ordering to ensure direct bolt-in compatibility.