Main Tank

The Main Tank is a location in Luigi's Mansion 3. It is found in the Boilerworks on the second basement floor of The Last Resort, located north of the Reservoir.

When Luigi first arrives the Main Tank, he encounters Clem sleeping at the Top. Luigi attempts to avoid waking him up again, only to end up stepping on a rubber ducky yet again, waking him. Clem gets irritated, but then gets the idea to fill the reservoir again. However, after Luigi rides an inner tube shaped like a duck, saves himself, and reaches the top because of the water, Clem decides to confront Luigi personally.

When Luigi visit's the Main Tank again, a Boo can be hiding.