The present invention relates to a water down plates (coating) apparatus, is connected to the wire in the flip to open and close the water outlet, as a seesaw motion plus valve lever for opening and closing the water outlet through the flip-flops; But the plus valve lever supported so as to be able to seesaw operation lever supporting portion coupled to the upper portion of the pole to which the flip-coupled by a hinge; Auto flush shaft unit for a seesaw motion to press the plus valve lever, so the flip is pulled so that the water outlet can be opened; Shaft which is connected to the automatic flushing shaft unit, a home position returning the auto flush shaft spring unit; The cover housing having a front cover and a back cover, but support the auto flush shaft unit; Provided in the cover housing is connected with the auto flush shaft unit, the auto flush to the basis of the linear motion moving the auto flush unit towards the lever support shafts button; It is interposed between the auto flush buttons and the auto flush flush button shaft spring unit to the original position to return the auto flush button; Manual input unit to be connected to the auto flush button, the operation of the automatic flush button manually; The auto flush the cam provided in the cover housing is connected with the auto flush shaft unit, on the basis of the rotational movement for moving the auto flush unit towards the lever support shaft; And coupled to the outer side of the cover housing is connected with the auto flush cam, includes at least one motor for automatically operate the auto flush cam.