Female -16AN to Male -20AN Adapter Fitting

The Female -16AN to Male -20AN Adapter Fitting is an essential component for custom fuel system, coolant line, and hydraulic brake installations where AN (Army-Navy) port sizes must transition between different system architectures. This adapter bridges the gap between -16AN female fittings and -20AN male connections, allowing technicians and enthusiasts to adapt legacy or OEM line sizes to larger-diameter systems without complete line replacement. Whether upgrading a fuel delivery system for forced induction applications or reconfiguring brake lines for upgraded brake kits, this fitting eliminates the need for costly custom hose fabrication.

Constructed from durable aluminum alloy, the Female -16AN to Male -20AN Adapter Fitting maintains the integrity of high-pressure fluid transfer while providing a smooth transition between port sizes. AN fittings rely on a 37-degree flare seat design that creates a leak-free seal without requiring tape or additional sealant, critical for performance applications where fluid loss or contamination risks engine damage or brake failure. The stepped bore design ensures minimal turbulence and flow restriction, preserving system pressure and efficiency. Compact dimensions (approximately 4.53 x 2.25 x 5.91 inches) allow installation in tight engine bay or chassis locations common to modified vehicles.

This adapter is indispensable for builders upgrading fuel system capacity, installing larger-displacement injectors, or transitioning to aftermarket fuel rails with different AN port configurations. Modified trucks and sports cars frequently require -20AN fuel lines to support high-flow fuel pumps and injectors, making this fitting a practical bridge for existing -16AN infrastructure. Installation requires hand-tightening followed by wrench securement; over-torquing can crack the aluminum body, so moderation is essential. Compatible with both fuel and coolant systems operating within standard automotive pressure ranges, this fitting delivers reliable, repeatable performance across countless restoration and modification projects.