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2.5 Gallon Auto Top Off Container for Aquarium Reef Tank reservoir ATO reservoirs feature crystal clear PC with an elegant top, to hold top off water for your aquarium in a closed container. The Trigger Systems ATO containers have a removable lid to prevent excess evaporation, while providing a large opening to refill and clean the reservoir as needed. Each ATO reservoir has two 0.25” OD holes for tubes to be plumbed through, or wires for float switches. Can be used as dosing conteiner. Dimensions: 9” diameter x 11” tall Opening to refill reservoir size An Auto Top Off container is great for holding a regulated amount of top off water. A properly sizes ATO reservoir will be able to supply a tanks ATO needs for a few days if not weeks, while not being too large to cause a big salinity swing, or flood the sump if the top off pump were to get stuck on. Most auto top off units will come with a pump that will need to be in the reservoir to pump water to the aquarium. The ATO units come with a super wide opening to allow a pump to be placed in the reservoir while having small 0.25” holes for the tubing to be plumbed through. Pump and pump tube not included Fload valve included