The Sentinel drain line alarm system alerts maintenance staff or a homeowner whenever a sewage line backup situation arises due drainage system blockage, flooding during a storm surge or backflow from the street sewer. When the internal sensor notices a pressure increase in the vertical portion of the cleanout tee an alarm sounds until the condition returns to normal. The alarm operates on a standard 120V electrical line or a 9V battery. In the case that there is a power outage, the 9V battery acts as an electrical back up.
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