#8 Female x #4 Male Swivel Reducer Black

The #8 Female x #4 Male Swivel Reducer Black by FRAGOLA is an essential adapter fitting for high-performance fuel, oil, and coolant line systems in modified vehicles and racing applications. This straight adapter connects larger #8 AN (JIC) female ports to smaller #4 AN male connections, making it indispensable when downsizing line diameters or interfacing incompatible hose sizes in custom engine builds. Whether you're refurbishing a fuel system after a turbo upgrade, installing adjustable regulators, or simplifying plumbing on a compact engine bay, this reducer allows seamless transitions without costly fabrication.

Manufactured from aluminum and finished in black anodize, the #8 Female x #4 Male Swivel Reducer combines lightweight construction with corrosion resistance—critical for engine compartments exposed to heat, fuel vapors, and moisture. The swivel female end allows hose rotation during installation without twisting the fitting body, reducing strain on connections and ensuring proper alignment in tight spaces. The straight design eliminates flow restrictions common in 90-degree adapters, maintaining system pressure and improving reliability in fuel injection and cooling circuits where flow dynamics matter.

Mechanics and fabricators routinely specify FRAGOLA reducers for engine swaps, fuel system upgrades, and custom radiator relocations where AN-line standardization simplifies assembly and troubleshooting. The compact 1.6 x 1.25 x 4.1-inch profile fits confined engine bays without interference with belts, hoses, or headers. Compatible with all standard #8 and #4 AN hose and port configurations, this adapter pairs reliably with braided stainless hoses, steel hard lines, and factory-style fittings—making it a proven choice for street machines, road race cars, and high-output builds where system integrity cannot be compromised.