Abstract: A self-gripping spring-biased accessory for directing water from an outside source to flush out the cooling system of a marine engine. The accessory comprises a U-shaped retainer terminating at its upper ends in a pair of resilient suction cups which are constructed to bear against the cooling water intake ports on opposite walls of the engine housing. At least one of the cups is connected to an external source of flushing water. A particular feature of the invention, disclosed in several different embodiments of the invention, is that the U-shaped retainer is provided with an auxiliary device to impart a spring-bias to the legs, urging them to move towards one another to secure the suction cups in resilient sealed relation against the cooling water intake ports. In a further modification, a device is provided to apply the flushing water simultaneously to intake ports on opposite walls of the engine housing.

Abstract: A flushing attachment comprising a resilient belt is constructed to be wrapped around and secured on the lower motor housing so that a hose fitting fastened through an opening in the belt registers with one or more water inlet ports on one side of the housing. The belt is disposed in wrap-around position to cover one or more additional water ports on the opposite side of the housing. When the motor is removed for cleansing, a garden hose is attached to the hose fitting to apply tap water to the set of water inlet ports on the one side, forcing a portion of the water into the motor and out through the cooling system. The belt is flexed in response to excess water pressure, releasing from housing ports on the opposite side that portion of the water which does not pass through the engine.