The TOTO DuoFit In-Wall Dual Flush 0.9 and 1.6 GPF Tank System Copper Supply Line and White Rectangular Push Plate provides you with the opportunity to save up to 9 inches of floor space within your bathroom. The DuoFit provides a dual flush option with TOTO’s Dual-Max. Dual-Max allows you to provide the right amount of flush for the required job. You can select between a 0.9 or a 1.6 gallons per flush with a push of a button. This system arrives with a rectangular white plastic dual flush push plate. The DuoFit harness allows you to select a mounting height of 15 to 19 inches. This provides the opportunity for you to establish a comfortable bowl height for a wide array of individuals. The in-wall unit can support up to 880lbs when installed properly. The kit arrives ready to be installed within a 2” x 6” stud setting. If you require installation within a 2” x 4” setting, you will need to additionally purchase TOTO’s 2” x 4” PVC outlet kit (THU343). This comes with a Copper supply and a 2” x 6” polyethylene waste outlet. If you want to enhance the toilet you choose with a WASHLET bidet seat, there is a pre-attached Copper supply built into the system. You will additionally have to purchase a TOTO WASHLET Connection kit to complete your WASHLET install (THU468). This DuoFit requires the toilet bowl to be purchased separately.