I knew you could flush it with the ear muffs, just didn’t know if you could with the thermostat housing off. Ok, got the thermostat housing cleaned really good. New thermostat and gaskets installed. New filters and fuel pump. Drained all the liquids. Put final coat of gel on the floor. Added medium texture to the final floor coat. On the way to put the stern drive on, refill her, muff her and flush her. Bouncing between excitement and prayer!