by approximately two to two and one half inches end 36 of extension member 26 is raised by a like amount causing lever arm 12 to rotate in a counterclockwise direction about the axis of flush handle 10 end 28 of extension member 26 raises by approximately one half as much as opposite end 36 or about one to one and one fourth inches consequently lift chain 16 is raised by an amount sufficient to partially open the flapper valve alowing water stored within tank 2 to drain into the toilet bowl for a time determined by pneumatic delay mechanism 40 as is known to those skilled in the art flapper valves are buoyant and when fully opened will remain in the open position until substantially all of the water has drained from tank 2 however depressing plunger 52 to its fully depressed causes the flapper valve to become only partially opened the rate at which water drains past the partially opened flapper valve is insufficient to equalize the water pressure above and below the flapper valve accordingly the pressure exerted by the water within tank 2 continuously urges the flapper valve down toward its seat during operation of the partial flush apparatus after the predetermined time delay effected by pneumatic.