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next to the toilet is a bathtub but it is not in use regularly because this is my guest bath. Iunderstand what you are saying about the water valve at the wall, I was hoping it was the o-ring but ass soon as i turn on the water from the wall, drip happens. It is not a lot of water, water spot is the size of a smoke detector, actually the water was dripping from the detector too.
The only other reason I thought it might be the o-ring was that when the water is off the tank seems to drain like I flushed the toilet but no drip occurs unless I turn the water on.