#3 AN Plug

The FRAGOLA #3 AN Plug (Part #480603) is a precision-engineered fitting plug designed for high-pressure hydraulic and pneumatic systems common in motorsports, aerospace, and industrial applications. This hex-head aluminum plug provides a secure, reliable seal for AN (Army-Navy) standard 3 AN port closures, delivering the exact dimensional and pressure ratings required for closed-loop fluid systems where leakage is unacceptable.

Constructed from aluminum and finished in blue anodize, this fitting combines lightweight construction with corrosion resistance—critical for extended storage and outdoor use. The blue anodized finish serves both as a protective barrier against oxidation and as a visual identifier conforming to AN fitting color standards, allowing technicians to quickly verify compatibility during installation and system maintenance. The hex-head design accommodates standard wrench sizing, enabling secure hand-tightening without risk of thread damage or over-torque failure.

This 3 AN plug is essential for anyone building or maintaining custom hydraulic lines in race cars, jet skis, aircraft, or industrial machinery. Whether you're closing off an unused port during system redesign, replacing a damaged plug, or completing a new fuel or coolant line assembly, a correctly sized AN plug prevents contamination and pressure loss. Technicians and fabricators rely on FRAGOLA plugs for their dimensional accuracy and ability to hold pressure under demanding conditions.

AN fittings follow military specifications (MIL-A-18001) and remain the standard across performance and aviation industries because of their proven reliability and global standardization. This individual plug ships ready to install and is sold as a single unit, making it ideal for replacement or spare-parts inventory.