Water saver

In a flush tank which has a chamber for water, a float controlled inlet valve and a flush outlet, a flush mechanism comprising a standpipe at the outlet, having a low level discharge passageway, a high level passageway, and a valve element for each passageway, a full flush lever having a captive end means mounted on the flush tank with a free end attached to the low level valve element and a partial flush lever having a captive end means pivotally mounted on the flush tank with a free end attached to the high level valve element, an operating shaft having a pivotal mounting on said flush tank and a handle, a positive drive between said shaft and said full flush lever and a free sliding engagement with said partial flush lever during rotation of said shaft in one direction, said shaft having in the opposite, rotational direction a positive drive with the partial flush lever and a free sliding engagement with the full flush lever, a radially retractable key means on the shaft, the captive end means of one of said levers having a shoulder and an adjacent space with the shoulder facing one side of the key means, the captive end means of the other of said levers having a shoulder and adjacent space with the shoulder facing the opposite side of the key means whereby rotation of the shaft in one direction operates one only of said levers and in the other direction only the other of said levers.