Do you mean the ATO container next to the tank?
https://www.containerstore.com/s/st...torage-boxes-with-lids/12d?productId=10036979
The ATO is: http://www.bulkreefsupply.com/smart-ato-micro-120p-auto-top-off-system-autoaqua.html
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question for you, I'm looking into getting this same ATO but I'm curious as to how far the water level has to drop before the pump is activated? like a measurement, 1/8", 1/4", 1/2" ??? any ideas??