Breast pump valve
Momcozy duckbill valve and diaphragm set for S9 Pro and S12 Pro
MCMWX20-NA00NB-RT
Fits 2 models · replace every 3 months
Wrong part, or your model missing? Tell us. A person checks every report.
GenuineGenuine Momcozy
$18.99
Amazon AU · 28 OctLowest genuine · Amazon AU · checked 28 Oct
CompatibleCompatible option
$8.50 each
2-pack $16.99
Amazon AU · 28 OctAmazon AU · checked 28 Oct
Check sellerCheck seller details
Genuine: made by Momcozy. Compatible: another brand.Genuine is made by Momcozy. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $8.50 each · 2-pack $16.99
Amazon AU. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 3 listings from 2 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.
Not due yet?
Get a nudge when your breast pump valve is due — it's every 3 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the MCMWX20-NA00NB-RT breast pump valve
Watch the guide or follow the steps.
- 1Wash your hands, take the pump off and separate the milk collector, flange and silicone parts.
- 2Remove the old duckbill valve and diaphragm and check the other silicone parts for cracks, tears or stretching.
- 3Before first use, wash the new duckbill valve and diaphragm and boil it for 5 to 10 minutes, then let it air dry.
- 4Fit the new duckbill valve and diaphragm in the same place as the old one, so it sits snugly and lies flat.
- 5Reassemble the pump and check for leaks or low suction before pumping.
Every number this part goes by
- Retail name:
- MCMWX20
- Retail name:
- MCMWX20-NA00NB-RT
- Retail name:
- Momcozy S12 Pro diaphragm
- Retail name:
- Momcozy S12 Pro duckbill valve
- Retail name:
- Momcozy S9 Pro diaphragm
- Retail name:
- Momcozy S9 Pro duckbill valve
Sellers list any of these; they are the same part.
Will it fit your appliance?
Type your model number and we'll check it against the makers' lists.
Common questions
- What does the MCMWX20-NA00NB-RT fit?
- The Momcozy duckbill valve and diaphragm set for S9 Pro and S12 Pro (part MCMWX20-NA00NB-RT) fits the Momcozy S12 Pro and S9 Pro.
- How often should I replace the MCMWX20-NA00NB-RT?
- Every 3 months, or sooner if it looks worn.
- Where can I buy the MCMWX20-NA00NB-RT in Australia?
- We track 2 Australian sellers for the MCMWX20-NA00NB-RT; the lowest listed price when we last checked was A$8.50 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the MCMWX20-NA00NB-RT?
- No tools, a few minutes: 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A stretched or torn valve or membrane lets the suction drop, so each session takes longer.
- Is there anything to reset afterwards?
- No reset: the pump has no reminder for this part, so set your own.
Something looks wrong with the MCMWX20-NA00NB-RT match? . Reports go to a person, not a bot.