In a message dated 11/16/01 6:36:50 PM Eastern Standard Time,
[log in to unmask] writes:
> We take the plastic package from the nipple, place the sterile side over
> the
> > opening to bottle & cap it with the nipple to make it air tight.
>
It's the plastic cover that makes the air tight seal. It's not hard plastic,
so it molds to the bottle.
Laura
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