The Neptune ATKv2 is an automatic top off kit that works on its own, with no Apex controller needed. It pairs optical sensors with a float valve to keep your tank level steady and help prevent overfilling.
Works standalone; an Apex controller is optional
Optical sensors combined with a float valve
Motor included
Includes an FMM module that can host extra accessories when paired with an Apex
Fill the top off reservoir with fresh water and check the water level regularly to confirm the system is working.