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The Sealand Tankwatch 4 holding tank monitor allows you to always know how full your tank is. The 3 adjustable probes allow it to be accurately installed into any holding tank. Featuring an attractive four light display panel this monitoring system takes the guess work out of "how full is my tank". Be sure and order the Universal Flange as well. This is the flange that the Tankwatch4 probes screw into.