Exact OEM Fitment: Serves as the factory-correct direct replacement for 664905R

Replace the 100145536 if you observe cracking

Universal Compatibility: Specifically threaded and tapered for a seamless fit with McDonnell & Miller RS series sensors

allowing for shaft-up or shaft-down installation common in condenser units

Grundfos 97523136 Pump 321142-301 Exact OEM Fitment: Serves asThe Grundfos 97523136 is a professional grade UPS50 60SF 3 speed stainless steel circulator pump designed for high demand hydronic heating, cooling, and hot water recirculation systems. Engineered with a corrosion resistant AISI 304 stainless steel housing, this 115V wet rotor pump is ideal for open loop systems where oxygen rich water would typically compromise standard cast iron components. As a veteran favored HVAC circulator pump, it features