Momcozy Flange Insert 21mm Compatible with Momcozy S9 Pro/S12 Pro/Medela/Spectra 24mm Shields/Flanges. Original S9 Pro/S12 Pro Breast Pump Replacement Accessories, 4PCS (21mm)

Falange sizes super important especially if your looking for great milk out put. I used the bigger sizes if didn’t work until I measured and actually my size was 21 mm so I think I recommend you buy your correct Falange size. This fits my momcozy s12 pro and I also believe it’ll fit momcozy s9. These are also comfy when it’s your correct size. It won’t be as painful. I recommend.

Made all the difference in the world. So much of breastfeeding is a new experience, I didn't know the difference the insert would make. My pump wasn't pulling any milk at first, but with the insert I had no problems. Easy to clean. Make sure to measure to get the correct size.

Compatible with the Momcozy S12 hands-free pump. Solved my painful pumping sessions and improved my milk output!

I've used these flanges every day for at least the last 6 months. They're still holding their shape and look like new. The plastic is soft and I dont even notice them in my spectra flanges. Have also used them in the new Willow handheld pump and they work good there as well.

Product helped and worked well with my mom cozy pump. I was disappointed to find that I couldn’t use it with any other pumps I have as usually flange inserts are interchangeable. I’m glad there are 4 inserts, they are very tiny and thinly made so back ups are necessary but they do what they need to do if you use the momcozy pump!