Ecotech Marine Versa Peristaltic Dosing PumpDose, change water, operate reactors and more, easily and reliably with the Versa. The All New EcoTech Versa is a specially designed aquarium peristaltic pump from EcoTech Marine. Much more than a traditional dosing pump, the Versa is extremely precise, robust, and versatile. The Versa excels in many precision aquarium pump applications, including; dosing, auto top off (ATO), automated water changes, and reactor feeding. Precision DC Stepper Motor