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The Drainage Control is a location in Luigi's Mansion 3. It is found in the Boilerworks on the second basement floor of The Last Resort, located east of the Drainage Control Hall and west of Sewer C.
When Luigi arrives at the Drainage Control, he parks his inflatable duck next to more inflatables and gets attacked by a Slinker and three Mini Hammers. Once they're defeated, Luigi needs to turn some valves on some pipes so Gooigi can go through and pull the drainage lever. After the water is drained, Luigi will have to walk through the sewers back to the Reservoir.
When Luigi and Toad enter this room, a Slinker will appear and grab Toad. He must defeat the Slinker to proceed.