#4 Female x #6 Male Swivel Expander Black

The #4 Female x #6 Male Swivel Expander Black from FRAGOLA is a straight-port hydraulic and pneumatic adapter designed for systems requiring a transition between different AN (Army-Navy) port sizes. This swivel expander serves technicians, fabricators, and enthusiasts who need reliable, secure connections in high-pressure fluid transfer applications—whether in racing fuel systems, brake lines, or custom pneumatic rigs. The swivel design accommodates misalignment during installation, reducing installation time and stress on connected components.

Constructed from aluminum and finished in black anodized coating, the #4 Female x #6 Male Swivel Expander delivers corrosion resistance and a professional appearance in any engine bay or system enclosure. The female #4 AN port accepts incoming lines, while the male #6 AN port threads outbound connections, creating a size-step adapter that expands flow capacity where needed. The swivel collar design allows ±15° of rotational freedom, eliminating the need for secondary alignment tools and preventing hose kink damage during final torque. Aluminum construction keeps weight minimal—critical in performance applications where every ounce matters—while maintaining structural integrity under standard operating pressures.

This adapter is ideal for custom fuel system builds, supercharger boost lines, and any application requiring a 4 AN to 6 AN transition with full 360° rotation capability. Installation requires standard AN wrenches and compatible hose or line fittings rated for your system's pressure rating. FRAGOLA adapters are manufactured to strict tolerances, ensuring leak-free performance and repeatable results across multiple installations. Whether upgrading an existing system or engineering a new one, this swivel expander eliminates common alignment headaches while delivering dependable, corrosion-resistant service.