#10 O-Ring Boss Plug

The A-1 PRODUCTS #10 O-Ring Boss Plug is a precision hydraulic and pneumatic fitting designed for high-pressure fluid systems where secure, leak-free connections are non-negotiable. This hex-head aluminum plug features an integrated O-ring boss configuration that meets industry standards for marine, industrial, and mobile equipment applications. The blue anodized finish provides corrosion resistance and identifies the fitting within AN (Air Force-Navy) standard systems commonly found on boats, hydraulic recovery equipment, and marine propulsion systems.

Sized to #10 AN specifications, this plug delivers the dimensional consistency and thread security required for applications where pressure spikes or vibration could compromise connection integrity. The O-ring boss design allows the sealing element to sit in a machined groove rather than relying on thread compression alone—a critical distinction in systems exposed to thermal cycling or high vibration environments like offshore fishing vessels or inboard marine engines. Aluminum construction keeps weight minimal while maintaining strength for typical system pressures, and the hex head geometry ensures straightforward installation and removal using standard wrenches.

This fitting is essential for boaters and marine technicians who maintain or repair hydraulic systems on center consoles, offshore sportfishers, and commercial vessels, as well as for equipment used in saltwater recovery and towing operations. Weekend fishermen upgrading or maintaining trim-and-tilt systems, jackplate hydraulics, or anchor winches will recognize the AN standard as the baseline for pressure fittings on serious marine hardware. The individual plug format allows targeted replacement without unnecessary component replacement, reducing downtime and repair costs.

AN fittings remain the gold standard in marine and aerospace hydraulics because their dimensional consistency and reusability prevent costly system failures. A-1 PRODUCTS plugs deliver that reliability at the component level, making this a practical choice for anyone restocking their onboard hydraulic spares or building a custom system.