This kit will allow you to flush the engine while it is running, therefore offering a more complete flush of the raw water cooled components. Fits the following engines with 1.5 inch (38 mm) I.D. inlet water hose: MerCruiser Marine QSD 2.0L, 2.8L & 4.2L diesel engines with Bravo drives MerCruiser Inboard engines Note: Mounting bracket in kit will need to be REMOTE MOUNTED.