Flange Insert



All our products are sent from our Warehouse/Office located in Geelong, VIC.

Same day dispatch if ordered by 10am, guaranteed next business day dispatch if ordered after 10am.


Free shipping available on all orders over $49.99 

Flat rate shipping of $9.90 on all orders below $49.99

Express Post: $11.99 for order above $49.99 - $15 for orders below $49.99


$5 for order above $49.99 - $15 for orders below $49.99

Note: when ordering a flange insert, select 2 if you want 2 - they do not come as a pair.

Do you need a smaller size?
We offer 4 options for women who need a smaller flange than 24mm.

Choose between our 15mm, 17mm, 19mm and 21mm inserts to suit your breast the best!a woman showing how to measure nipples 
 for flange insert


  • The perfect solution for small-nippled mothers.
  • Silicone material, BPA-free.
  • Offers four size options for a customizable fit: 15mm, 17mm, 19mm, 21mm


Before using the insert, place it in boiling water for 5 minutes. Make sure the insert is completely submerged in water. Every time you use this type of replacement breast pump parts, wash it in soapy water, rinse it with clean water, and air dry it afterwards.


Mumilk flange insert is made from soft and flexible high-grade silicone, which conforms to the shape of your breast and provides a secure seal. It easily attaches to the flange of the Mumilk portable breast pump, allowing for a customized fit for each mum.

Our flange inserts come in four sizes: 15mm, 17mm, 19mm, and 21mm, to ensure a comfortable and effective breast pump experience—the perfect solution for breastfeeding mums who need a smaller flange size. 

Whether you are experiencing discomfort or simply need a smaller flange size to optimize your breast pumping experience, our Mumilk Flange Inserts are the perfect solution. 

Add the Mumilk Flange Insert to your breastfeeding essentials today and experience the comfort and convenience it brings to your breast-pumping routine.

Customer Reviews

Based on 51 reviews
Tanika Ross (Melbourne, AU)

I found the Ella really good to pump colostrum. I had trouble with pumping once I came home from hospital but now have worked out how to use and can get over 120ml from each breast in 5 mins. Very happy with my purchase.

Rach P (Sydney, AU)
Size down if in between sizes

I measured in between sizes and originally sized up to a 19mm flange. It worked well but the 2nd flange I bought was a 17mm and was a far better fit. It's great that these are available for those of us who need smaller sizing. Very easy to fit into my Ella breast pumps.

Kiran Grewal (Sydney, AU)
Mumilk pump and flange insert

Love the product and my pump

Chloe Nash-Appleby (Perth, AU)

Flange Insert

Anonymous (Perth, AU)
Still not received!

I order this now 2 weeks ago and still have not received it nor is it giving me an updated date anymore it says it has been delayed for more then a week now! Not impressed at all last time I am ordering from this place

Hi Maddie,
As you can see on the tracking link, you placed your ordered on the 9th, and we shipped on the 10th.
There's been major delayed with AUS Post which, as I'm sure you can appreciate, is totally out of our control.
This would have happened with any orders you placed, with any businesses.
I beleive your frustration is with the postage, more than with our brand/products.
Note that in any case, orders from VIC to WA will take longer, and we encourage you to select express postage if you wish AUS Post to prioritise your order.
I am not too sure what else, as a company, we could have done.