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The Old Reservoir is a location in Luigi's Mansion 3. It is found in the Boilerworks on the second basement floor of The Last Resort, located west of the Drainage Control Hall. The room's upper level leads to Waterworks.
The Old Reservoir is only accessed when Luigi visits Boilerworks again to rescue Toad. Luigi and Toad have to stand on the pressure plates to reveal the motor, then Gooigi must suck or blow to move the rotating platform above. Luigi can make a Gem Goob appear by tossing a bucket of paint on the upper-left wall, then must defeat it to obtain the white gem.