this unit ensures perfect fitment and electrical compatibility

You may hear a loud humming

though upstream strainers are recommended for maximum service life

it's built to handle chilled or hot water

Lochinvar & A.O. Smith 100278092 Switch R-407C this unit ensures perfect fitmentThe Lochinvar & A. O. Smith 100278092 Switch is a critical safety and operational component designed for high performance commercial boilers and water heaters. As a factory authorized OEM flow switch, this assembly ensures the burner circuit only energizes when adequate water velocity is detected, protecting the heat exchanger from dry fire conditions and thermal stress. The unit comes integrated with a durable brass tee specifically sized for CC120