Flushmaster Flush Port Quick Connect For Mercury Applications, White, SM-FMQCMW

The Flushmaster SM-FMQCMW is a marine-grade quick-connect flush port adapter designed to permanently replace the factory flush port cap on Mercury 4-stroke outboard engines (75 HP to 500 HP). It eliminates the hassle of unscrewing stuck OEM plugs and allows you to snap a standard garden hose directly onto the engine for routine freshwater flushing.

Key Specifications & Compatibility

• Engine Compatibility. Fits 4-stroke Mercury outboards from 75 HP to 500 HP, including Verado, Pro XS, FourStroke, and Racing V8 and V10 models.
• Materials & Seal. Constructed from marine-grade, UV-resistant polymers with a corrosion-resistant 316 stainless steel internal spring and a double O-ring seal to prevent leaks.
• System Integration. Works as a standalone manual adapter with a standard 3/4-inch garden hose, or pairs with an optional Flushmaster Controller for automated multi-engine flushing.

What's Included in the Kit

Each kit outfits one engine and includes the following components:

• Mercury Male Quick Connect. Screws permanently into the engine's flush port and locks into the cowling.
• Female Hose Quick Connect. Attaches to the end of your garden hose for one-handed click connections.
• 90-Degree Elbow & Hose Clamp. Included to prevent kinks in the internal flush hose behind the cowling if needed.
• Installation Wrench. Used to securely tighten the fittings during setup.

Design & Installation Notes

• Built-In Weep Hole. Just like the factory Mercury cap, the adapter cap features a weep hole. Because the adapter sits slightly proud of the cowling, it provides a clear visual indicator if water drips while the engine is running, signaling debris or a failing internal check valve.
• Quick Setup. Installation involves unscrewing the OEM plug from the 3/4-inch female hose outlet, removing the factory lanyard, threading in the Flushmaster Quick Connect, and twisting it a quarter-turn clockwise to lock it into the cowling.