Grey Beard's Niagara 500 ml/m Rotary Pump Especially designed for Water Uses the 120-Volt AC/ 12-Volt DC Transformer 500 ml/min flow rate at ambient temperature, Runs dry with out damage Uses peristaltic pump technology, Self-priming, Low ampere draw Quick tube replacement with no tools required High-quality manufacturing using virgin high-strength resins and component materials from some of the world's leading suppliers to both the manufacturing and medical device industries