Reef Octopus VarioS DC pumps allow you to precisely control the flow through the sump, closed loop system, or reactors in your aquarium. With the VarioS Controller, you have total control over the pump's flow, can switch between feed modes (15 and 60 minutes), add a safety float switch (which is included), or just connect it to an Apex or other third-party controller. Maximum Flow: 1720 GPH Maximum Head: 16 feet 5.7" L x 3.75" W x 5.5" H for dimensions Effective, secure, and dependable Five Flow Settings: Accurate pump control for any use. True Slow Startup: Energy-efficient and gentle on equipment. Controller that is detachable and waterproof. Float Switch: Establishes a new benchmark for pump security. A rotatable valve rotates at intervals of 90 degrees. Internal Memory: Preserves