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

The #12 x 1-1/16-12 Radius O-Ring Fitting in black from Fragola is a critical hydraulic connection component designed for high-performance fuel, oil, and coolant line applications in modified and race vehicles. This fitting serves mechanics and automotive enthusiasts who demand reliability in custom fuel systems, supercharger setups, and engine modifications where standard hose clamps fall short. The radius O-ring design provides superior sealing integrity compared to conventional straight-thread adapters, eliminating weeping leaks that plague poorly sealed fuel and pressure lines.

Fragola's radius O-ring technology employs a precisely machined groove that captures and compresses an elastomer seal, creating a metal-to-metal junction with redundant sealing surfaces. The #12 size (standard AN12 equivalent) accommodates hoses and adapters rated for high-flow applications, while the 1-1/16-12 thread specification ensures compatibility with common fuel rails, filter housings, and pressure regulators found in LS swaps, turbo conversions, and naturally aspirated builds. Black anodized aluminum construction resists corrosion from fuel additives and engine heat while maintaining structural integrity under sustained pressure cycles—critical for forced induction and carbureted systems that experience pressure spikes.

This fitting excels in carburetor fuel inlet ports, auxiliary fuel system plumbing, and coolant bypass circuits where vibration and thermal cycling would compromise O-ring retention in standard JIC adapters. Installers benefit from the self-centering geometry that reduces torque-strip risk during assembly—a common failure point when retrofitting aftermarket fuel management into vintage or heavily modified platforms. For engine builders and tuners standardizing on Fragola's complete line, this connector maintains system integrity across multiple pressure applications while reducing troubleshooting time at the dyno or track.