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Lochinvar & A.O. Smith 100208660 Flow Switch 320735-701 Is this switch compatible withThe Lochinvar & A. O. Smith 100208660 Flow Switch is a critical OEM safety component engineered to monitor fluid velocity within the primary heat exchanger loop. As a veteran grade HVAC replacement part, this liquid flow switch utilizes a high precision #1 paddle assembly to detect consistent water movement, preventing the dry firing of high efficiency boilers. It serves as a direct replacement for WTR2210, WTR2210K, and 100173714 part numbers.