Abstract: A device and method that simplifies marine maintenance for inboard motorboats. The device and method allows an individual to safely flush the engine of a motorboat while the boat is out of the water by simulating the fluid circulation conditions of a boat in the water. More specifically, the device and method eliminates the danger of damaging the boat's engine on account of excessive fluid flow through the engine by utilizing the boat's coolant pump propulsion system to pull precise amounts of fluid through the system at appropriate flow rates and pressure levels.