Reef Octopus VarioS DC pumps provide you with improved performance and accurate flow control through the sump, reactors, or closed-loop system 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: 792 GPH Maximum Head: 13 feet Measurements: 4.15" H x 5" L x 3" W Effective, secure, and dependable Five Flow Settings: Accurate pump control for any use Indeed Slow Startup: Energy-efficient and gentle on equipment Detachable Waterproof Union Controller Float Switch: Establishes a new benchmark for pump security A rotatable valve rotates at intervals of 90 degrees. Programming is stored in integrated memory.