First you need to ascertain whether or not you do in fact have a leak, you
will need two pieces of metal thin enough to fit into the little slits, hold
one in the right hand and one in the left then stick them in there. If you
wake up in heaven or a hospital then you've got a leak. Seriously either
your neighbor is pulling your leg or he's stupid. Those little plastic plugs
are mainly used to keep kids from doing what I just mentioned above. You
don't mention how much higher the bills are, would expect slightly higher
bills in the winter. Especially in Jan and Feb.
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