walls of vent pipe 32 other actuating arrangements may be employed as would be known to one skilled in the art for example a mechanically actuated grate valve or shutter valve may be employed along the lines taught in the united states patent to rose et al discussed above a mechanical linkage may be taken off for example push rod 22 as seen in fig1 15 flush handle 18 includes a mounting sleeve 90 which is non rotatably secured to toilet tank 8 for example by means of a nut 91 threaded onto the inner end of the sleeve an operating lever 92 has an elongate hollow shaft 94 inserted through the mounting sleeve and rotatably secured therein by a clip 96 or the like clip 96 is fitted over the inner end of hollow shaft 94 push button 98 is slidably secured within the operating lever for rotation therewith as the lever is rotated to operate the flushing mechanism push button 98 is mounted on operating lever 92 for co operative rotation therewith within a mating annular collar 93 a lock pin 100 projects from operating lever 92 into a corresponding recess within push button 98 button 98 is secured within annular collar 93 by a retaining ring 102 button 98 has secured to its inner end valve operating rod 22 which passes through flexible tube 21 and hollow tank hold down bolt 20 into operating valve 16 mounting sleeve 90 has at its outer end a plate 95 which is drawn against tank 8 by the.