Can run dry without damage. Free from vibrations, very quiet. Internal bypass limits inlet pressure. Permanent magnet motor with self-lubricating shaft. The 4 valves avoid the typical throbbing of other autoclaves when the tap is half open. With 4 fasteners (2 with 1/2" thread + 2 to 14mm with 1/2" hose connection) and suction filter. Fasteners and filters snap through snap lock a.