#8 x 3/4-16 (#8) Radius O-Ring Fitting Black

The #8 x 3/4-16 (#8) Radius O-Ring Fitting Black by FRAGOLA is a precision hydraulic and fuel line adapter engineered for high-performance automotive applications where reliability under pressure is non-negotiable. Built for custom fuel systems, power steering upgrades, and turbo plumbing installations, this compact fitting delivers leak-free connections in tight engine bays and complex routing scenarios. Whether you're tuning a street rod, building a track-focused engine, or installing aftermarket boost systems, this FRAGOLA connector eliminates guesswork and delivers OEM-grade sealing performance that withstands vibration and thermal cycling.

The radius o-ring design uses a captured elastomer seal that conforms to precise mating surfaces, creating a metal-to-metal contact surface with superior vibration damping compared to straight thread fittings. The #8 designation (1/2-inch nominal hose ID) paired with the 3/4-16 port thread ensures compatibility with standard SAE porting on carburetors, fuel pressure regulators, and aftermarket manifolds. Black anodized aluminum construction resists corrosion in harsh underhood environments while maintaining lightweight specifications—critical when building motorsports systems where every ounce matters. The compact 4.1-inch length and 1.3-inch width allow installation in confined spaces without requiring custom fabrication or adapter stacks.

Mechanics and engine builders trust FRAGOLA fittings for naturally aspirated and forced induction platforms where fuel or coolant system integrity directly impacts reliability and safety. This fitting excels in street machines, circle track engines, drag racing fuel systems, and custom hot rods where repeated pressure cycling and temperature extremes demand zero-tolerance sealing. Installation is straightforward—apply a thin layer of thread sealant to the port connection, torque to manufacturer specifications using a wrench on the fitting body (never the hose barb), and verify no leakage during system pressurization. Compatible with braided stainless hose, rubber fuel line, and closed-loop coolant circuits; verify port thread compatibility with your specific application before ordering.