Seamule Flushmaster Flush Port Quick Connect for Mercury Outboards Flushmaster has created a quick and easy way to flush your Mercury outboard engine. This quick connect flush port is designed to permanently replace your existing OEM flush port plug. It allows you to get a quick connection every time you flush your outboard during routine maintenance. Easy to use all you have to do is twist off the cap, connect your hose, flush the system then reverse the steps. Constructed from marine grade mat