S9/S12/S9pro/S12pro Duckbill Valve and Silicone Diaphragm, Compatible with NaNaLazy/TSRETE/momcozy, Wearable Breast Pump Replacement Parts Accessories (4 Piece Set)

Great

I was so nervous to order these. From the photo I had no idea how it would fit on my momcozy. I ordered them anyways because the momcozy size I had was way too big and hardly got any milk.Getting the right size flange is a HUGE deal in pumping and helping you produce more milk. (Be sure to get measured at the hospital after baby and they'll help you get the right size!)But this product came in and is great quality. It was easy to assemble to my momcozy and was seamless (you can hardly notice I added them to the inside). They were the correct size for what I needed and helped create a stronger suction! The only downfall is it's one more thing to take off and remove but soooo worth it for having the right size flange.

I’m a breastfeeding/pumping momma who purchased a Momcozy pump and has a bit of elastic nipples. The size 24 flange I think runs a little big and it has a short “tunnel” so my nipple was getting pulled back far and getting pinched in the top while causing pain and loosing suction. I tried a Maymom insert and cut it to fit bit no luck. I tried the beaugen which worked a but was annoying. Sticky, never really adjusted to the correct size (always loose) and turned an ugly yellow color. I tried these and was worried they wouldn’t work because it covers the suction hole. But they worked! It covers the suction while but there is still room between the suction and the insert so it doesn’t effect output. I was so happy they worked I cried! This is the only insert that worked for me and my Momcozy pump. Saved my pumping journey especially now that I EP. In another review I saw that their insert stuck out a bit but mine goes all the way in. The first two weeks it’s snug and you have to gently push it in or even fold it a bit and flatten it out in the Momcozy pump. Over time it “molds” and slides in perfectly.

Works great for my Momcozy s9pro

Does not work all the time with Momcozy s12 pro. You have to mess with it and we shouldn’t have to do that. Do not buy!

Works well but I feel the duck valves tend to slip off. They are shorter than my previous ones.

After the original duckbill valve tore, I found these replacements were half the price of the original parts so I decided to try them. You can tell the material is thicker and a little different than the original manufacturer's parts, but it does work as intended. They have outlasted the original part so far (by about a month) and have not started to show any wear. I would buy them again.

I have now exclusively pumped for two children and these are above and beyond the best duckbills that I have used. I will only buy these when I need to replace mine because they give me the best suction and have increased my milk production as a result