ATK V2 Auto Top Off Kit

The Neptune Systems ATK is a self-contained automatic top-off system engineered to maintain consistent water levels and salinity without requiring an Apex Controller. Featuring dual optical sensors, a mechanical float valve backup, and intelligent IQ-Fill technology, the ATK delivers three layers of redundancy to prevent overfilling and system failures. The included PMUPv2 pump handles vertical lifts up to 4.3 metres, making it suitable for most reservoir setups. While fully functional standalone, the ATK integrates seamlessly with Neptune Apex systems for remote monitoring, email alerts, and expanded automation capabilities. Ideal for reef keepers seeking reliable, hands-off water replenishment during travel or daily maintenance routines.