#6 O-Ring Boss Plug

The #6 O-Ring Boss Plug from A-1 PRODUCTS is an essential hydraulic fitting for anyone serious about marine maintenance and system integrity. Whether you're managing a commercial fishing vessel, recreational cruiser, or towing operation, this compact adapter seals unused ports and prevents fluid leakage in your boat's hydraulic or fluid transfer systems. Built to withstand the corrosive saltwater environment and vibration-heavy conditions of the water, this plug protects your equipment investment by keeping contaminants out and pressure contained.

The O-Ring Boss design relies on a precision-molded elastomer seal that creates a dependable, leak-free closure when threaded into female boss ports. The #6 size fits standard SAE ports found on trim tabs, ballast systems, and hydraulic manifolds common in modern marine applications. The minimal profile—just 2.85 inches in length—ensures it won't interfere with tight engine compartments or deck installations, while its 0.03-pound weight keeps system weight calculations accurate. A-1 PRODUCTS manufactures this to exacting standards, using durable materials rated for both freshwater and saltwater exposure.

This plug is ideal for boat owners performing system upgrades, winterization, or maintenance on hydraulic-equipped vessels. When you disconnect or remove components from your trim system, ballast pump, or steering actuator, a proper #6 O-Ring Boss Plug prevents system contamination and fluid weeping that can lead to corrosion and sensor failure. Installation requires only hand-tightening into the female boss port—no special tools necessary. Keep spares on hand for emergency repairs or seasonal storage to protect your boat's critical hydraulic infrastructure and maintain resale value.