Reef Octopus VarioS 8 Controllable Circulation PumpReef Octopus VarioS DC pumps give you enhanced performance and precise control of flow through your aquarium's reactors, sump, or closed loop system. With complete control through the VarioS Controller, you can control the flow of the pump, enter feed modes (15 or 60 minutes), add a safety float switch (included), or simply connect it to a third party controller like an Apex. Max Flow: 2700 GPH Max Head: 18 FT Dimensions: 5. 7" L x 3. 75" W x 5. 5" H