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Every time we open the water dispenser, the air inside the bottle
would exchange with the air outside to keep a balenced pressure,
but the external gas is polluted, as well as the air inside the bottle.We only need to insert the bucket into the water dispenser,and
the plug would automatically float to the surface and sense the
pressure changes.The plug would give out gas so as not
to exchange with the outside air,which
can keep the air in the bottle clean,and
the water can be saved for a longer time.
Her Shin Lou Siyu Zhu Yuye Guo Huizhuo