Allows operation of engine when not in the water. Flushes engine to remove salt and other contaminants from the cooling system.FitsMercury / Mariner outboards with side water intakes,Mercury MerCruiser stern-drives (except Blackhawk)Mercury Torque Master gear casesL6 Verado 200/225/250/275/300/350/400R ModelsModels with dual water pickup such as...