Hi Guy,
That is designed to
be left in, and yes it is an eye dropper of sorts. I call them a "dropper top". Some folks do pry them out though,
and from what I hear, occassionally you *have to* get them out when they don't work too well. They always seem to
work for me though. I would try it that way first, but you can get them off with a butter knife pretty
easily.
B
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