It’s for the external ATO and AWC fill tanks. The sensor is on the bottom 1/4 of the tank and will serve as an alert that they need to be filled (if the level dips below the sensor)
Ok that makes sense then. I though that was the sensor to activate your ATO. My ATO storage is automatically refilled by my Hydros, but not too often since it is a 20 gallon Brute can.
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