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Title: fits and works like new!
Review: These valves fit perfectly into our playtex sippy cups. They were previously leaking all over the place because we had kind of abused the old valves in the dishwasher. my son is clearly having to work harder to get the liquid out of the sippy cups now, but hopefully the valves will break in a bit and get easier. it'll always be a trade-off of course. easier to drink = easier to spill, but i'm happy my car is no longer covered in milk.
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