Grundfos Circulator UPS20-30N is a canned rotor pump (pump and motor form an integral unit without shaft seal and with only two gaskets for sealing). The bearings are lubricated by the pumped liquid. The pump has 3-step speed selector and is characterized by a stainless-steel shaft, ceramic radial bearing system, carbon axial bearing, stainless-steel rotor can and bearing plate, corrosion-resistant impeller, and stainless-steel pump housing. The motor is a single-phase motor. No additional motor protection is required.