Momcozy Original S9 Pro/S12 Pro Duckbill Valves & Silicone Diaphragm 1 PCS

These flange inserts were a game changer for my pumping experience. The sizing options made it easy to get a much better fit, which improved comfort and efficiency right away. The silicone is soft but sturdy, and they stay in place well during pumping. I noticed less discomfort and better output once I started using them. They’re easy to clean and fit perfectly with my pump. Highly recommend for anyone trying to fine-tune their flange size and make pumping more comfortable

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

Functions as advertised. Fits in my Momcozy M9 wearable pump flanges.

For any breastfeeding moms out there I HIGHLY recommend this pump. I have used it since my daughter was born and have loved it every step of the way. This pump has been so useful and handy. It has made my pumping journey so smooth and not like a chore. While in the hospital I used the pumping set up that you have to sit and be attached to and it was a hassle and felt like I was stuck and couldn't do anything else. With this pump I am able to continue doing my daily tasks. I can pump anywhere and everywhere, literally. So anyone on a pumping journey trying to find a good pump, this is the one. It is easy to use, easy to clean and affordable.

I’ve used multiple brands of flanges, these were by far my favorite. I got the most production with these.

Overall this pump works well and does its job. I needed a single pump that wasn't too expensive, because my cat chewed a piece of one of my Lansinoh wearable pumps and ruined the motor. I gave this one 4 stars because 1) there are so many parts to clean (cup, flange, connector, membrane, duckbill, and if you're like me you need a flange insert), and 2) it doesn't feel like it's suctioning that much. It does remove milk so obviously it works, but it doesn't always make you feel confident that it's working lol. Also I don't like that the screen turns off while it's running, as I constantly have to press the button to see how long it's been running.

Review: I bought the Momcozy S12 Pro wearable breast pump for my wife, and it’s been an excellent choice. She loves how comfortable, discreet, and truly hands-free it is. The 3 modes and 9 suction levels let her adjust it to her needs every day. It’s easy to use, clean, and take anywhere, and the smart display makes the whole process even more convenient. Definitely a product that has made her breastfeeding experience much more comfortable and practical.

I really wanted to hate these pumps — and I didn’t. For context, I currently own three pumps: the Eufy S1 Pro, the BabyBuddha 2.0, and the Momcozy S12 Pro, which is my second wearable. I originally did not trust Momcozy at all. While pregnant, I actually canceled an order after repeatedly seeing claims on Reddit and WhatToExpect that Momcozy infiltrates mom groups and posts fake reviews. The overwhelmingly positive feedback felt suspicious, and it was genuinely hard to find a bad review, which only increased my skepticism. Fast forward to postpartum: Momcozy ran a good sale on Amazon, and curiosity got the best of me. I figured I’d try them as a backup wearable. When I tell you I was shocked by how much I liked them, I mean it. The suction is strong — stronger than my Eufy S1s for me — and the output was consistently amazing, even better than the Eufy, which I love. They fit comfortably in my bra, are relatively discreet sound-wise for a wearable, and sit on the breast really well. Considering the price difference, I truly did not expect to fall in love with their performance the way I did. However, the problem — and it’s a big one — is durability. I’ve only been using these pumps for about two weeks, and not even daily, probably every other day at most. I am extremely meticulous with my pump parts. I do not put these in the Momcozy dishwasher or sterilizer (which is frustrating in itself, considering how expensive that product is and the fact that their own pumps aren’t compatible with it). Instead, I wash them carefully in hot but safe temperatures and follow all guidelines. Despite that, the collector pieces already seem warped, like the sizing has slightly changed, and the suction consistency feels off. I’m now at a point where I need to replace parts far sooner than I should, especially given how lightly they’ve been used. I’ve seen many people online say that Momcozy parts need frequent replacement, but this feels far too soon. What makes it more frustrating is that I rely on wearable pumps at home because I have toddlers, and now I’m waiting four days for replacement parts to arrive. That completely defeats the purpose of having a convenient wearable pump available when you need it. And replacements parts are expensive !!! Overall, I love the suction, the fit, the discreetness, the output, and the price point. What I don’t love is the quality control and how quickly parts seem to degrade, creating an expectation that replacements are just part of owning this pump. If I had to rank the pumps I own, the Eufy S1 Pro is hands down number one — it truly is everything people say it is and feels like a perfect pump. Momcozy S12 Pro comes in second because the performance is excellent, but the longevity is questionable. BabyBuddha 2.0 ranks last for me, as it’s powerful but not ideal for my lifestyle. If you want strong suction and great output at a lower price, the Momcozy S12 Pro delivers — just be prepared for frequent part replacements and potential frustration. I wanted to love these pumps without hesitation. Instead, I love them with reservations.