All the proven features of the model No. 400A, plus Leak Sentry technology to halt costly undiscovered toilet tank leaks. Works by preventing endless refills of a leaky tank when a tank is emptied by a leak, its unique locking action forces people to press the flush lever twice (once to refill and again to flush). At most, only 1 tank of water can leak from a model No. 400LS equipped toilet. Adjustable bowl refill prevents wasteful overfill. Ideal for hotel/motel, multi-housing applications, vacation homes, and seldom used bathrooms. Toilet always remains operational. Height adjusts 9" to 14" to fit most toilets, including 1.6 GPF models. Anti-siphon operation, code approved. Made of corrosion-resistant materials that withstand harsh water and constant use. 5 year warranty.