Key Performance Features

• Mercury-Specific Threading: Designed with the exact thread pitch required to replace the factory flush port plug on most modern Mercury outboards.

• One-Handed Operation: Features a heavy-duty quick-release sleeve. Simply click the hose adapter into the engine-mounted port—no more cross-threading or struggling with slippery hands.

• High-Flow Design: Engineered to maintain maximum water volume and pressure, ensuring that fresh water reaches the thermostat and the furthest reaches of the engine block.

• Corrosion-Resistant Internals: Unlike cheap hardware store quick-connects, the Flushmaster uses marine-grade springs and seals that won't seize or leak after exposure to saltwater.

• Integrated Seal: Comes with a high-quality O-ring to ensure a watertight fit, preventing cooling water from leaking out while the engine is running.

Technical Specifications

In The Box

• 1 x Mercury Engine-Side Flush Port Adapter

• 1 x Garden Hose-Side Quick Connect Fitting

• 1 x High-Compression O-Ring

Installation & Maintenance Tips

• Hand-Tight Only: When installing the adapter into your Mercury's flush port, tighten it by hand. Over-tightening with a wrench can damage the threads on the engine's plastic cooling shroud.

• Saltwater Rinse: Even though it's a flush port, give the exterior of the quick-connect a quick spray with fresh water after use to keep the sliding sleeve moving freely.

• Check the O-Ring: Once a season, inspect the rubber O-ring for cracks. A dry or cracked ring can allow air into the cooling system or water to leak out during operation.