Sea-Dog Motor Flush Muff

SD 521500-1

Flush muffs are the most common way to flush an outboard. Connect the inlet fitting on the muff to a garden hose, fit the muffs over the engine's water intakes on the sides of the gear case, turn the water on, start the engine, and run it at a fast idle (maximum of 1000 rpm for 10 minutes). Note that every engine manufacturer provides their own specifics, and instructions can vary according to the horsepower, so refer to your engine's owner's manual. Inside length: 9"