The IceCap ATO EZ Auto Top‑Off System is a reliable, plug‑and‑play solution designed to automatically replenish evaporated water in marine or freshwater aquariums. Featuring a triple optical sensor setup—including dual sensors for normal operation and a third safety sensor for backup—it prevents overfills and pump run‑dry scenarios. The compact magnetic sensor housing can mount to clear, tinted, or painted surfaces up to ½″ thick. Everything you need is included: the controller, refill pump, power adapter, tubing, siphon-break, and mounting hardware—all engineered for quiet, dependable operation.