The Seachoice Adjustable Inboard Engine Flusher flushes sand, silt, and alkali from your inboard motor. It features a telescoping shaft for precise alignment, especially in hard-to-reach areas. The large diameter suction cup eliminates fall-off or blow-by while flushing. -Designed to flush sand, silt, and alkali from your inboard engine -Easily installs on raw water strainer for inboard engines without tools -Telescoping shaft ensures precise alignment, especially in hard-to-reach areas -Shaft length: 18-1/2" to 31" -Large diameter suction cup eliminates fall-off or blow-by while flushing.