FitMatch

The Momcozy M9 takes the Momcozy M9 duckbill valves (2-pack) (part AS255-GR71NB-A) as its valve; replace it every 3 months; Australian sellers list it from A$10.50 each as of 1 November 2026. Fitment confirmed against the manufacturer's compatibility list.

Momcozy M9

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Breast pump

Confirmed against Momcozy's list

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AS255-GR71NB-A

Takes the AS255-GR71NB-A

Valve · every 3 months · check the code on your old part.

Other Momcozy breast pumps and their valves, membranes and tubing

The AS255-GR71NB-A fits the M9 only. These Momcozy models take a different valve:

Genuine

$10.50 each

2-pack $20.99

Momcozy Australia · 1 Nov

Compatible

See seller

No compatible seller tracked yet

Genuine: made by Momcozy. Compatible: another brand.

Lowest price · $10.50 each · 2-pack $20.99

Momcozy Australia. Every seller we track is listed below. Some links earn us a commission.

Open Momcozy Australia

This breast pump also takes a silicone diaphragm

Compare 1 seller

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

Momcozy AustraliaGenuine · checked 1 Nov$10.50 each2-pack $20.99Open
Open cheapest seller · $10.50 each · 2-pack $20.99

Opens Momcozy Australia in a new tab. Their page is the source of truth for price, delivery and returns.

Not due yet?

Get a nudge when your valve is due — it's every 3 months. One email two weeks before, no newsletter. Manage or stop it anytime.

Also saves the model to a FitMatch account under this address; the email signs you in, no password.

How to change the valve in your Momcozy M9

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:
AS255
Retail name:
AS255-GR71NB-A
Retail name:
M9 duckbill
Retail name:
Momcozy M9 duckbill valve

Sellers list any of these; they are the same part.

About your M9

Momcozy breast pump — M series. Its valve is the M9 duckbill valves (2-pack), part AS255-GR71NB-A, changed every 3 months.

Also in this breast pump: Momcozy M9 diaphragms (2-pack) (every 3 months).

Where the model number is: The model name is printed on the motor unit or its base, and on the box. Wearable pumps also show it in the maker's app.

Fits this Momcozy model

Momcozy1 model

Common questions
Which valve fits the Momcozy M9?
The Momcozy M9 takes the Momcozy M9 duckbill valves (2-pack) (part AS255-GR71NB-A).
How often should I replace the valve in my Momcozy M9?
Every 3 months, or sooner if it looks worn.
Where can I buy the AS255-GR71NB-A in Australia?
We track 1 Australian seller for the AS255-GR71NB-A; the lowest listed price when we last checked was A$10.50 at Momcozy Australia. Prices are re-checked daily and dated on this page.
How do I fit the AS255-GR71NB-A in a Momcozy M9?
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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