The Momcozy Flange Insert 4 Pack is a set of replacement flange inserts designed to fit the Momcozy M5, M6 and M9 wearable breast pumps. Slotting inside the existing flange, each insert reduces the tunnel diameter to give you a more personalised fit — helpful if the standard flange feels too large. It's ideal for mothers looking to fine-tune comfort and support smoother expressing, and comes as a value pack of four in a single chosen size.
Getting the right flange size is one of the most overlooked parts of comfortable pumping. Bodies and nipple sizes differ, and a fit that's too big or too small can cause rubbing, squeezing or leaks. These inserts are available in 15 mm, 17 mm, 19 mm and 21 mm, so you can dial in a size that suits you. Made from 100% food-grade silicone, all milk-contact parts are BPA-free and meet stringent safety standards.
How it Works
- Personalised fit: The insert sits inside the flange to narrow the tunnel, which helps create a more comfortable seal for those who find the standard size too wide.
- Supports the seal: A better-fitting flange is designed to help enhance the suction process during pumping and can reduce the chances of leaks or discomfort.
- Smoother draining: A comfortable, well-aligned fit helps the breast milk to drain more smoothly through the flange.
Finding your fit
Choosing the correct flange size matters for both comfort and efficiency. If you notice nipple swelling, rubbing or squeezing during pumping, it may be a sign you need a different size. Measure regularly and change your inserts as your fit changes — it's not unusual for this to shift over your feeding journey.
How to Use
Clean the inserts after each use with warm, soapy water and rinse thoroughly. To sterilise, submerge in hot water (approximately 100°C) for 5–10 minutes. Do not microwave sterilise, as this can cause the parts to melt. Allow the inserts to air dry completely before the next use.
A note on pump maintenance
Some breast pump accessories need replacing regularly to keep your setup performing. If your pump seems to have lost suction, the first thing to check is your parts — particularly the valves — for wear, fraying or stretching, and replace them if needed.
Best For
The Momcozy Flange Insert 4 Pack is a great option for parents who:
- Use a Momcozy M5, M6 or M9 wearable breast pump and want a more personalised flange fit
- Experience rubbing, squeezing or leaks and suspect their current flange size is off
- Want a spare set of inserts on hand so cleaning turnaround never holds up a session
Care & Maintenance
Helps breast milk drain more smoothly
Personalised fit to help reduce leaks or discomfort
Universally compatible with M5/M6/M9 wearable breast pumps
BPA-free, food-grade silicone, safe for milk contact
Momcozy M6 Breast Pump
Momcozy M9 Breast Pump
- 4x Flange Insert