Trigger Systems

Crystal ATO 5 Gallon Reservoir

In stock
Out of stock
$106.24 $124.99

- +

Crystal ATO reservoirs feature crystal clear acrylic to hold top off water for your aquarium in a closed container to help keep dust and debris out. The Trigger Systems ATO containers have a removable lid to prevent excess evaporation, while providing a large opening to refill the reservoir as needed.

Each ATO reservoir has two 0.25” OD holes for ato plumbing or wires for float switches.



6” long x 14” wide x 15” tall - Overall reservoir size

3 7/8" long x 6 3/8" wide - Opening to refill reservoir size


An Auto Top Off container is perfect for holding a fixed amount of top off water. An appropriately sized ATO reservoir would be able to supply your 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 Trigger 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 routed.


Crystal 5 – 6” long x 14” wide x 15” tall

Crystal 10 – 10” long x 16” wide x 15” tall

Ruby 5 – 6” long x 14” wide x 15” tall

Ruby 10 – 10” long x 16” wide x 15” tall

Emerald 5 – 6” long x 14” wide x 15” tall

Emerald 10 – 10” long x 16” wide x 15” tall

More Information
UPC 744271816471
Dimensions 6”L x 14”W x 15”H
Total Volume 5 Gallons
Color Clear
Write Your Own Review
You're reviewing:Crystal ATO 5 Gallon Reservoir
Your Rating
Only registered users can write reviews. Please or

Product Questions

Does this topper come with an optical sensor and pump?
Question by: Steve on Dec 15, 2023, 9:12 AM
Hey there, This only includes the ATO reservoir and the lid. Thanks!
Answer by: Codey on Jan 8, 2024, 2:33 PM