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TankWatch® I - Holding Tank Alert System No more overfilling your holding tank. Highly reliable micro float switch activates a red warning light when tank is full. No electrical components come in contact with waste -- no messy probes to clean. Easy to install on any rigid tank material. Operates on 12-volt DS. Includes micro float switch, panel and gasket.

TankWatch 4 The most flexible level indicator available. Easy to install on any size freshwater, graywater or blackwater holding tank. Its micro float switches indicate full, as well as two owner-determined tank levels for mid and empty. No electrical components come in contact with waste or water -- no messy probes to clean. Operates on 12-, 24-, and 32-volt DC. Includes cap with micro float switches, designer indicator panel, gasket and stainless steel mounting hardware. (Use SeaLand's Universal Flange Kit, part number 230272, to install on existing rigid tanks.)