The AI Axis 20 Centrifugal Pump is the smallest in AquaIllumination's Axis return pump line, built for tanks 15 gallons or less. Despite its compact size, it brings features usually reserved for larger, pricier pumps — wireless smart control, a quiet DC motor, and anti-siphon calibration. Flow rate: ~185 GPH (700 lph) Max head: ~5ft (1.5m) Power: variable, 12W max, 100-240VAC input Dimensions: 2.125in diameter x 5.5in tall Nozzle sizes (barbed): 0.5in (12mm) small, 0.625in (16mm) large — interchangeable for different plumbing setups Coordinated modes: a single button on any connected AI pump can switch all your AI pumps into feed or maintenance mode together Anti-siphon calibration: instead of shutting off completely, the pump keeps spinning without producing flow — this prevents back-siphoning and avoids air bubbles when it resumes normal operation The anti-siphon calibration is a genuinely useful detail for a return pump specifically — a pump that fully stops can let water siphon backward through the plumbing, and this design avoids that failure mode entirely.Compatible replacement parts: barbed nozzle sets for the Axis 20.
