The TOTO DuoFit In-Wall Toilet Tank with Dual-Max Dual-Flush 1.28 and 0.9 GPF System with Copper Supply is a modern and efficient design that saves up to 9 inches of floor space compared to standard floor-mounted toilets. This in-wall tank system features a copper supply line for added durability and a one-piece blow molded polyethylene tank to prevent leaks. With an adjustable mounting height of 15 to 19 inches, this system can support up to 880 pounds, making it ideal for a wide range of individuals. TOTO's Dual-Max flushing system allows you to conserve water with a full or light flush option, giving you the choice between a 0.9 or 1.28 GPF flush. Pre-plumbed for optional WASHLET connection, this in-wall tank system comes with a one-year limited warranty and requires assembly. Additional information: