Geberit 111.012.00.1 Concealed Dual Flush Tank For installation in wood or steel stud walls that provide support equal to 6.75-Inch depth For 2-hole wall-hung wash-down WC with fastening distance 7.1-Inch (18 cm) or 9.1-Inch (23 cm) Toilet heights 15-Inch - 19-Inch Supports up to 800 pounds