Cap Plug 4an (2pk)

The Cap Plug 4an (2pk) by EARLS is a precision fluid system component engineered for tactical operators, military personnel, and professional mechanics who demand reliability in high-performance hydraulic and pneumatic applications. These plugs seal 4 AN (5/16-inch) ports on fuel lines, brake systems, and pressurized equipment, preventing fluid loss, contamination, and air infiltration during transport, storage, or field maintenance. Whether you're maintaining vehicle systems in austere environments or ensuring mission-critical equipment stays combat-ready, this two-pack delivers redundancy and dependability.

Manufactured to EARLS' exacting standards, the Cap Plug 4an features a threaded design that seats firmly into AN-standard ports without over-torquing, reducing risk of cross-threading or port damage in field conditions. The compact 4.15-inch profile and minimal 0.01 lb weight make these plugs ideal for go-bags, vehicle emergency kits, and field repair packs where space and weight discipline matter. Material composition and finish are optimized to resist corrosion from moisture, salt air, and fuel exposure—critical for sustained operational readiness in desert, maritime, or arctic deployments.

This two-pack is essential for law enforcement SWAT teams, military mechanics, civilian tactical shooters who maintain their own vehicles, and emergency responders managing fluid systems under pressure. The Cap Plug 4an integrates seamlessly with any 4 AN hydraulic or pneumatic line assembly, including brake systems, fuel injection platforms, and custom fluid delivery networks. Stock these plugs alongside your tool kit and replacement hose inventory—when a pressurized line ruptures or disconnects in the field, having matched backup plugs prevents cascading equipment failure and mission abort.