Flush saltwater, silt and other contaminates from Mercury outboards and MerCruiser sterndrives. After running in saltwater or through silty water, it is good idea to flush the engines cooling system to remove debris and corrosive saltwater. These kits are designed to work with Mercury outboards and MerCruiser sterndrives to run freshwater through the cooling system at idle. An adjustable locking rod secures rubber cups to the side raw water intake openings which provide a garden hose connection for freshwater supply. Outboards and sterndrives with dual pick-ups require the Flush Seal Kit to block off front pickups and allow the Flush kit to supply cooling water without it running out of the additional ports. Key Features Designed to work with Mercury outboards and MerCruiser sterndrives 2000 and newer with and without dual raw water pick-ups Allows engine to be run at idle out of the water to remove debris and saltwater Flushing reduces adverse effects of particulate and saltwater contamination Outboards and sterndrives with dual intakes require Flush Seal Kit (881150Q1) in addition to Flush kit Merc p/nApplicationWM Model No.44357Q2Fits most Mercury outboards and sterndrives with side raw water pick-ups1661669881150Q1Required for use with above flush kit on 2000 and newer V6 outboards with dual raw water pick-ups; 2000 and newer, Bravo, X , XR, XZ and Sterndrives with dual raw water pick-ups6543490