The SmartSump™ has a unique sump pump cover design, so water from a plumbing leak fills an alarm pocket on the lid first, sounding a WaterWatch® alarm that will let you know there is a plumbing leak. From there, the water flows down a special airtight floor drain that will let the water down, but damp air cannot come up into your crawl space. The WaterWatch® sump pump alarm also alerts you to pump failure for any reason, including power outages.