Fake-A-Lake is a simple solution for the occasional need to flush your engine, engine tune, winterize or anytime you need to run an inboard engine out of water. Fake-A-Lake is safe, the rubber cup compresses against your hull to ensure proper tension, producing dependable sealing on any hull shape. Works on all boats without trailer obstructions. Adjustable in height from 16 inches to 28 inches. Will not fit 1997+ Correct Craft and other boats with indented hulls.