This is the round Sealing Disc which seals the bottle so that milk doesn’t leak. It’s held down by the Screw Lid (they are sold separately so you’ll need one of those too).
Medela Valve Membrane for Special Needs/SoftCup
$4.40
Skip Hop - Zoo Smart Serve Plate & Bowl
$29.90
Medela Bottle Top Sealing Disc
$5.83
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