Quala Ultrasonic Cleaners feature self-contained generators in a variety of sizes and capacities to provide efficiency and dependability for all your cleaning applications. Constructed with a durable stainless steel tank, with vinyl-clad steel and aluminum housing. Swivel drain offers a convenient system for draining the machine. Equipped with a 60-minute timer. 2-1/2 year warranty on all cleaners. Quala Sweep Machines utilize sweep technology, a cleaning wave that sweeps back and forth throughout the ultrasonic tank, reaching all corners of the machine - no reduced cleaning areas.