Geberit’s UP720 Concealed Tank and Carrier System fits in a standard 2- by 4-in. wood or steel wall. The dual-flush tank uses 0.8 gpf or 1.6 gpf and can be adjusted to accommodate seat heights from 15- to 19-in. The steel frame can support up to 880 lbs. Myriad wall-hung toilet bowl models are compatible with the system.