4AN Tee with Female Swivel on Branch Black

The 4AN Tee with Female Swivel on Branch Black from Redhorse Performance is an essential hydraulic fitting for custom fuel, coolant, and fluid distribution systems in modified vehicles. This T-junction adapter serves as a critical junction point in high-performance engine builds where multiple fluid lines must converge or branch from a single source. Whether you're designing a custom fuel system for a turbocharged engine, integrating auxiliary cooling circuits, or plumbing a complex water methanol injection setup, this compact tee fitting delivers the reliability professional mechanics and serious enthusiasts demand.

Manufactured to AN (Army-Navy) standard specifications, the 4AN Tee features a female swivel branch connection that allows 360-degree hose rotation—critical for tight engine bay installations where hose run geometry is constrained. The swivel design eliminates stress concentration at the fitting-to-hose interface, reducing the risk of leaks and premature hose failure under boost pressure or thermal cycling. The black anodized aluminum construction resists corrosion in harsh under-hood environments while maintaining a professional appearance in custom engine bays. The compact 3.6 x 2.8 x 9.05-inch footprint and lightweight 0.06-pound design make it ideal for precision plumbing in space-limited applications where weight savings matter.

This fitting is indispensable for tuners and fabricators building custom fuel distribution blocks, intercooler circuits, or dual-pump fuel system configurations. The female swivel branch accommodates standard -4AN braided hose, ensuring compatibility with industry-standard plumbing components and making system modifications or repairs straightforward. Installation requires only basic hose-crimping equipment and standard AN adapter knowledge—no special tools needed. Pair this tee with quality -4AN hose and stainless clamps to complete reliable, leak-free fluid circuits that withstand sustained high pressure and elevated temperatures common in forced-induction and modified cooling applications.