FitMatch
Momcozy V1 Pro and V2 Pro duckbill valves (4-pack)

Breast pump valve

Momcozy V1 Pro and V2 Pro duckbill valves (4-pack)

AS158-NA71NB-A

Fits 2 models · replace every 3 months

Wrong part, or your model missing? Tell us. A person checks every report.

Genuine

$5.25 each

4-pack $20.99

Momcozy Australia · 1 Nov

Compatible

$3.26 each

6-pack $19.57

Amazon AU · 28 Oct

Check seller

Genuine: made by Momcozy. Compatible: another brand.

Lowest compatible · $3.26 each · 6-pack $19.57

Amazon AU. Compare with genuine below. Some links earn us a commission.

Open Amazon AU

Compare 2 sellers

AUD, before delivery. Each price shows when it was checked.

Amazon AUCompatible · checked 28 Oct$3.26 each6-pack $19.57Open
Momcozy AustraliaGenuine · checked 1 Nov$5.25 each4-pack $20.99Open
Open cheapest seller · $3.26 each · 6-pack $19.57

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.

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How to change the AS158-NA71NB-A breast pump valve

Watch the guide or follow the steps.

No clear video for this part yet. The steps cover it.

  1. 1Wash your hands, take the pump off and separate the milk collector, flange and silicone parts.
  2. 2Remove the old duckbill valve and check the other silicone parts for cracks, tears or stretching.
  3. 3Before first use, wash the new duckbill valve and boil it for 5 to 10 minutes, then let it air dry.
  4. 4Fit the new duckbill valve in the same place as the old one, so it sits snugly and lies flat.
  5. 5Reassemble the pump and check for leaks or low suction before pumping.
Every number this part goes by
Retail name:
AS158
Retail name:
AS158-NA71NB-A
Retail name:
Momcozy V1 Pro duckbill valve
Retail name:
Momcozy V2 Pro duckbill valve
Retail name:
V1 Pro duckbill
Retail name:
V2 Pro duckbill

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.

Fits these 2 Momcozy models

Momcozy2 models

Common questions
What does the AS158-NA71NB-A fit?
The Momcozy V1 Pro and V2 Pro duckbill valves (4-pack) (part AS158-NA71NB-A) fits the Momcozy V1 Pro and V2 Pro.
How often should I replace the AS158-NA71NB-A?
Every 3 months, or sooner if it looks worn.
Where can I buy the AS158-NA71NB-A in Australia?
We track 2 Australian sellers for the AS158-NA71NB-A; the lowest listed price when we last checked was A$3.26 at Amazon AU. Prices are re-checked daily and dated on this page.
How do I fit the AS158-NA71NB-A?
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.

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