As a veteran-grade fan pulley

eliminating the mechanical failure points and sediment buildup common in traditional float-style devices

the internal bi-metal disc may have fatigued

Technical specifications confirm 60Hz operation and a weight of approximately 6

Grundfos 97523134 Pump 318423-701 As a veteran-grade fan pulleyThe Grundfos 97523134, also identified as the UPS50 60F, is a high performance three speed circulator pump engineered for demanding hydronic heating, cooling, and district heating systems. This wet rotor circulator features a cast iron pump housing and a canned rotor design, where the motor and pump form an integral unit without a mechanical shaft seal. By utilizing the pumped liquid for bearing lubrication, this unit ensures quiet, maintenance free