| 摘要 |
A water tank for a flushing system of the type having a flap valve fastened in a siphon tube and alternatively controlled by a main control knob and an auxiliary control knob to discharge different volume of water for washing a lavatory bowl, wherein rotating said main control knob causes a siphon tube to operate so as to let water be completely discharged out of the water tank; rotating said auxiliary control knob causes a float to descend with the flushing water and actuate a siphon interruption in the siphon tube so that a reduced volume of water can be discharged out of the water tank for washing a lavatory bowl.
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