#4 Female Swivel Connect

The #4 Female Swivel Connect by FRAGOLA is a precision aluminum adapter fitting designed for high-performance fuel, oil, and coolant line systems in automotive applications. This straight-configuration swivel connector allows mechanics and fabricators to redirect or extend AN-format hose runs while maintaining a secure, leak-free connection on both ends. Whether you're building a custom fuel system for an engine swap, upgrading a forced-induction cooling loop, or repairing damaged fuel line sections, this adapter solves common plumbing challenges in engine bays where rigid piping meets flexible hose.

Each #4 Female Swivel Connect features dual 4 AN female swivel ports, machined from lightweight aluminum and finished in blue anodize for corrosion resistance and professional appearance. The swivel design on both ends eliminates stress concentration at connection points, a critical factor in fuel systems operating at 40–60 psi or higher where vibration and thermal cycling cause fitting failure. The blue anodized coating protects against oxidation and provides visual identification of AN-size fittings in a crowded engine bay. Weighing just 0.03 lbs, this compact adapter measures 2.85 inches in length, making it ideal for tight spaces typical of modern turbocharged or LS-swap installations.

This adapter is essential for fabricators working with braided AN hose assemblies, fuel cell installations, and intercooler piping where routing constraints require mid-line directional changes. The dual-swivel configuration is particularly valuable in high-vibration environments—such as naturally aspirated or turbocharged engines—where fixed-port adapters can crack under load cycling. Installation requires standard AN wrenches and compatible -4 hose ends or hard-line fittings; always use thread sealant rated for fuel on male threads, and torque connections to manufacturer specifications to prevent leakage.