Covers the combination of a toilet bowl and an anchor plate for mounting the toilet bowl on the floor of a room. The underside of the toilet bowl is provided with two tapered lugs or other projections which are to receive two corresponding projections of the anchor plate. The structure enables the toilet bowl to be adjusted in its relative position with respect to the anchor plate so that the bowl may be slid or moved, within predetermined limits, to meet the rear wall of the room where the bowl may be attached and held firmly against the anchor plate and against the floor.