Abstract: A mounting ring assembly for a toilet bowl having a vertically oriented tubular member having a predetermined height. An annular flange extends radially outwardly from the top end of the tubular member. A base plate is located a predetermined height above the bottom end of the tubular member and it extends radially outwardly from the outer surface of the tubular member. A plurality of gussets connect the annular flange and the base plate. A plurality of open end slot assemblies are formed in the top surface of the annular flange and each of these have a bolt head slot and a bolt shank slot. A framework of a bottom wall, a pair of laterally spaced side walls and an end wall are formed around the open end of the open end slots. The open end slots receive bolts that are used to attach the base of a toilet bowl to the mounting ring assembly.