is connected the single closed end of open ended cylinder 32 top end 36 being penetrated by tubing 30 here again the open passageway of flexible tubing 30 communicates with the plenum interiorly to cylinder 32 it becomes very apparent that flapper valves 18 commonly available may be utilized for the subject invention without modification if entrance into the interior cavity may be easily gained access to the interior cavity is afforded if one end of flexible tubing 30 is connected to a sharpened piece of rigid tubing referring now to fig5 to one end of flexible tubing 30 has been added a short piece of rigid tubing 60 which has been provided with a sharpened point much like a hypodermic needle this sharpened point is pushed through the soft rubber of flapper valve 18 so as to communicate with the plenum therein by such means already existing flapper valves may be utilized to comprise a portion of the invention it is also apparent that by adjustment of the relative height position of cylinder 32 fig1 and 2 in the toilet reservoir tank the water used for a partial flush may be varied for example locating cylinder 32 at a relatively high elevation in the reservoir tank will.