I use my tub for plants when i go away on trips..a week at a time. i put them
in the tub on top of plastic container and fill with hot water midway to that
container. When I arrived home, the plants survived, but all the water has
drained. Does that mean there is a leak in the drain? Its hard to tell with the
tub into the floor.
The "drain stoppers" (for lack of a better layman's term) on tub
drain/overflows is not particularly good, for holding water over the
long term. There are no gaskets, or seals, to prevent water from
seeping by. It is basically, a piece of metal, blocking the pipe.
The metal is raised or lowered, by the little lever.
Some newer drains (often called "toe poppers") that are NOT operated
by a lever (instead you simply push them and they stay up or down,
have a gasket that MAY seal a little better than the old style drain.
So to answer your question, the bathtub drain is not designed to hold
water for extended periods of time. It's only designed to hold water
long enough for you to take a bath...usually not more than an hour or
two at most. So there is probably nothing wrong with your drain and
not holding water over extended periods of time would, IMHO, not
indicate a problem.
But not better than the 'really old' style drains. When I was a kid back
in the 40s, the tub drain stopper was a white rubber tapered plug with a
pull chain that was attached to the tub somewhere (forgot where).
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