AquaOne Technologies’ Toilet Guardian is an electronic water-saving device that shuts off water to the toilet when a leak or overflow is detected. The eco-smart valve easily attaches between the water supply line and the tank. Two small sensors work in tandem or separately to completely surround the toilet with protection from tank to bowl. It addresses flapper and fill valve leaks, stuck flappers, rusted bolts, cracked tanks and clogged toilets. AquaOne Technologies.