it's not one of these new ball cock is it. The one that looks like and upside down plastic cup? as for the over flow thing there must be some outlet. I know in my toliet that there is a conventional overflow, which just runs out of the house; there is also another overflow which once it fills up and exceed this point it runs down the centre pipe directly to the bowel.
this probably hasn't helped but it's all i've got.
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