#20 x 1-5/16-12 (#16) Radius O-Ring Fitting Bk

The #20 x 1-5/16-12 (#16) Radius O-Ring Fitting in black from FRAGOLA is engineered for high-pressure fuel and fluid systems in custom engine builds, performance modifications, and motorsport applications. This compact adapter serves as a critical junction point in fuel rails, turbo feed lines, and nitrous systems where reliability under extreme conditions is non-negotiable. Designed for technicians and enthusiasts who demand leak-free connections in tight engine bays, this fitting bridges incompatible hose and line sizes with precision engineering.

The radius o-ring design eliminates traditional ferrule-and-bite sealing in favor of a captured elastomer seal that conforms to both male and female surfaces, dramatically reducing leak paths common in vibration-prone engine compartments. The #20 port size (typically 5/16-inch hose barb or SAE adapter) connects to a 1-5/16-12 thread specification, making it ideal for OEM fuel rails and custom manifold ports found on LS, big-block, and turbocharged applications. FRAGOLA's black-anodized aluminum construction resists corrosion and maintains visual consistency with modern engine bay aesthetics while delivering the pressure rating demanded by forced-induction and direct-injection fuel systems.

Mechanics and engine builders rely on FRAGOLA fittings when OEM adapters fail or custom plumbing routes demand compact, stackable solutions. Installation requires only hand-tightening the o-ring fitting into the receiving port—no ferrule adjustment or leak-down testing loops needed. Verify your fuel rail or manifold port matches the 1-5/16-12 female thread and confirm hose sizing aligns with the #20 inlet before ordering to ensure seamless integration into your cooling, fuel, or boost system.