Niagara's innovative and stylish Stealth® Ultra-High-Efficiency Toilet goes a step beyond standard water-saving toilets with a 0.8 gallon per flush (GPF) flush rate. Stealth has truly revolutionized the toilet market with its low-profile body, breakthrough patented hydraulic technology and the quietest flush on the planet. By harnessing the energy of water filling the tank, Stealth uses a patented air transfer system to pressurize the bowl's trapway. Once activated by pressing the flush button, the swift, powerful and quiet flush evacuates all waste in the bowl, using just 0.8 (3 liters) of water. Offered in both round-front and elongated bowl models, and adaptable to fit a 12'' rough-in installation, Stealth easily replaces existing toilets, lowering water usage and utility bills like no toilet ever has!