Actually, I too have a bowl that does not fill so bought a
replacement valve kit just because the refill tube was defective.
Turns out that the little tube that goes in the pipe must supply just
the right amount of water to fill the bowl before the tank gets full.
Of course, it doesn't hurt if it runs over a bit. Some valves have a
screw adjustment to control the refill rate. Other's don't.
It is limited by design. If the mechanics are working properly it will
fill to the same level. In many applications if there are high gusty winds
it will partly empty the bowl. Also over time a seldom used bowl will lower
Water in the bowl is called the spot. Some designs have a low spot. These are
generally the bowls that do not have a flush jet. I forget the theory behind
the bowls with high spots vs low spots, but if you google the net, you will
probably find an expert.
Another cause of a low spot could be the bowl is not level.
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