The paddle wheel sensor on my boat may be yanked from inside the engine room and replaced w/ a blank plug.
My paddle wheel mount has an internal rubber flapper that shuts when removed to limit the water intrusion.
Mine requires periodic cleaning to remove marine growth from the moving parts, then it reverts to normal operation.
FWIW, my depth transducer may also be removed for cleaning, but there is NO flapper. When I yank that I cover the opening w/ my hand, then jam the plug to have acceptable water intrusion.
