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The indicator panel has a single red light which is activated by the float switch inside the holding tank. When the "full tank" light is activated, the operation of any plumbing fixture connected to the holding tank should stop until the tank is emptied. Panel measures 3-1/4"W x 2"H.
The probe assembly installs into a 1-1/4" diameter opening on the top of the holding tank. As the level of contents rises, the float switch inside the tank is pushed upward and activates the "full tank" light on the indicator panel.