#6 Female x #4 Male Swivel Reducer Black

The #6 Female x #4 Male Swivel Reducer Black from FRAGOLA is a straight adapter fitting designed to connect AN-rated hydraulic and pneumatic lines of different sizes in high-performance systems. This reducer bridges #6 AN female swivel ports to #4 AN male connections, making it essential for custom fuel systems, coolant lines, and pressure-line applications where size transitions are required. Whether you're building a race engine fuel system, custom cooling loop, or rebuilding hydraulic circuits, this adapter provides a reliable step-down solution for professional and enthusiast technicians.

Constructed from aluminum with black anodized finish, the #6 Female x #4 Male Swivel Reducer delivers corrosion resistance and a clean, professional appearance in engine bays and under-car installations. The swivel female end allows for rotational adjustment during assembly, reducing installation stress on connected hoses and fittings—a critical feature that extends component life and prevents seal damage. The straight design eliminates unnecessary flow restrictions while maintaining full structural integrity under pressure, and the black anodize coating provides durable protection against fuel, coolant, and environmental exposure without compromising lightweight performance.

This adapter is ideal for customers converting older fuel systems to modern AN standards, downstepping larger feed lines to smaller carburetor or injection inlet ports, or reconfiguring factory hydraulic circuits for custom applications. The compact 1.5-inch overall length fits tight engine compartments and frame rails, while the reversible installation approach gives builders maximum flexibility in system layout. Compatible with all standard #6 AN female swivel hose ends and #4 AN male ports, this FRAGOLA fitting meets industry pressure ratings and works seamlessly with Teflon-lined hose, braided steel assemblies, and rigid aluminum tubing for lasting reliability.