The stainless steel threaded float always floats on the water. When the water level rises, the float also rises. The rise of the float drives the connecting rod to rise. The connecting rod is connected to the valve at the other end. When it rises to a certain position, the connecting rod supports the rubber piston pad to close the water source. When the water level drops, the float also drops, and the connecting rod drives the piston pad to open.
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