Flange Inserts 21mm 6PC,Compatible with Momcozy S12 Pro/S9 Pro/S12/S9 Wearable Breastpump Cup,Suitable for Medela/Spectra/Elvie/Willow/TSRETE 24mm Shields/Flanges,Reduce 24mm Tunnel Down to 21mm,6pcs

Perfect! They work best in a 23soze flange, but I’ve been able to use them in 20 with effort and 25 though that’s a bit big. No way in 28 they get sucked in haha but that’s expected - they’re not made for that size. I’ve used them with hard plastic flanges and silicone flanges and they work wonderfully with both.

Exactly what I needed to help my mom cozy pump work a bit better and be a bit more comfortable. Used the sizing tool to get the correct size. Easy to clean and easy to pop in to use.

I’m really pleased with this product! It arrived promptly and was in excellent condition. It’s just as described, and the quality is outstanding. It works perfectly and has made a real difference. I’m thrilled with my purchase and feel it’s worth every penny.I’d highly recommend this to anyone looking for something dependable and high-quality. I’ll definitely buy again!

Fits perfectly in momcozy M5

The inserts fits perfectly and easy to wash

I hate that breast pump flanges mostly come with a standard size of 24/28mm. I needed flange inserts specific to my sizing & these were perfect. The quality is good compared to others I’ve purchased (I.e thicker rubber, doesn’t tear). I would recommend these if you’re looking for a good flange insert in bulk.

I ordered these in 3 different sizes because I wasn’t sure what was going to be the best fit. The sizing guide is amazing, and honestly you can no beat it for the price! I use them on my momcozy s12pro, my momcozy s9, and my spectra. So definitely bonus points that I can use the same inserts for all my pumps!

Didn’t fit properly in 24 mm flange. My supply dipped drastically when trying to use these with my spectra pump.