The Reef Octopus VarioS 2 Controllable Circulation Pump is a DC propeller pump for return, reactor feed, or closed-loop circulation, built with a ceramic shaft and propeller bearing for long service life. Five speed settings, a float switch connection, and two feed/pause modes give you precise control over flow. Best for: return pump duty, reactor feed, or closed-loop circulation Included: float switch, power supply, input/output unions, stepped barb output fitting, protective intake screen Controls: 5-speed controller, feed/pause modes, 0-10V input for third-party controller integration Design: true slow-start ramp, waterproof 3-conductor union, rotatable output in 90-degree increments This is the circulation-pump (propeller impeller) version of the VarioS line — for a skimmer-specific pinwheel version, see the VarioS 2S.Compatible replacement parts: ceramic shafts and impellers for the VarioS 2.