Upgrade Duckbill Valve Compatible with Momcozy S12 Pro/S9 Pro Hands-Free Breast Pump Wearable,S9/S10/12 Breast Pump Replacement Accessories,for Momcozy/TSRETE Wearable Breast Pump Parts,6pcs

It fits good. Very useful

I REALLY wanted to like these.However, after using them for almost 2 months I’m over it. I think that type of silicon this duckbill is made of is too slippery.Today, one of them popped right off 10 minutes into my second pump session of the day. The pump parts were all washed yesterday, and dried completely over night. I assembled the pumps & used them in the morning. Then during the second use of the day, all of a sudden there was no suction on one pump.This means I have to take the pump off, open the cup, remove the duckbill that’s most likely floating in the breast milk. Then, rinse and dry the duck bill, dry the area where the duck bill slides onto inside of the cup & then slide the duck bill back in place. You then have to make sure the pump is sealed shut correctly, put the pump back on & restart the pump.It’s a HUGE pain & it happens often. When I say often I mean it happens probably once a day. It’ll happen more often if you don’t properly rinse/dry the duckbill before reinserting it into the cup. Same goes for the area the duckbill slides onto. You have to make sure you dry the area well because if not the duckbill will just immediately pop right back off or pop off again while you are pumping.I’ll be going back to the momcozy brand duckbill.

These make putting my pumps together in the dark easier. After having a few pumping sessions not work because I had the original duckbill valves not lined up correctly, it had to get these. It’s such a simple product that solved such a big problem for me

Awesome dupe. Giving a 4 out of 5 stars because the look is not quite the same as the mom cozy duck bill, so it's not necessarily an exact dupe. But it does the job great!

These fit perfectly for my legendairy milk collection cups! Functions just like new now!

These worked great the 1st (and maybe 2nd use) time on my Momcozy s12 Pro. Now they fall off after every use. I have to push them back on each time and I’m not producing as much as Inhsed to because they don’t hold their form well. I think the just stretch too easily. I won’t be purchasing again.

Not good

Got these valves because I hated installing the original duckbill valve for the tsrete. Originally I enjoyed them because it was easy to install. However they started to rip and lose suction. ive only had them for 3 weeks. Thought these were going to last at least 1-2 months.