Dual, Two Tank Model, Right Tank equivalent to a UM120W, Left Tank to a UG4000E Right Tank Cleaning Cycle: High Pressure Water activated by Foot Pedal Right Tank Manual Cleaning: Flow through Brush & Wash Nozzle Left Tank Cleaning Cycle: Wash, Air Flush, Clean Rinse (100cc) and Air Flush Diaphragm Pump: Air Consumption: 2 CFM Output: 3 US Gal per minute at 85 PSI