17mm Flange Insert Compatible with Elvie Stride, S18 S21 S23, Medela, for Spectra S1 S2, TSRETE, Momcozy S9 Pro S10 S12 Pro Wearable Pumps, Reduce 24mm Breast Pump Flanges Down to 17 mm, 2PC

I love these more than I thought I would. I bought these as replacements since you’re supposed to replace them every few months. I chose these for several reasons; the first being that they’re cheaper than the elvie ones, and second because they were pink so I could keep track by color which ones I had replaced most recently.They’re great and I think they increased the suction of my pump. Not just because they’re newer, I also was given a brand new set of the elvie brand diaphragms shortly after I got these and I feel like these work better!! I’ve had no issues with leaking and my brand new elvie brand diaphragms leaked. So I’m sold on these!! I just wish they came in different colors so I could replace a few at a time and keep track of which had been replaced.Overall great value and I’m definitely going to order more!

These parts do not function properly. There is no suction which means the pump does not extract any milk with these membranes or valves.I bought two of these to replace the old in my 3 sets of Elvie stride cups but they don’t work at all so that’s $40 wasted.Unfortunately, I think you have to stick to shelling out money for the official Elvie parts.

I bought these inserts for my Willow Go pumps, they work great. I haven't had any issue with suction or them coming off/loose.

The media could not be loaded. The product does not work. I pumped for over an hour and that’s all it got out. I even tried the parts with the original elvie parts thinking maybe just the valves or the other piece but still nothing. I gave a second try and still nothing. I’m trying to request a refund since it says I can and it only gives me trouble shooting options.

I like the soft texture of these, but I like being able to see inside my flange. I wish they were clear instead of pink.

The media could not be loaded. I have the Willow Go and also use the Medela Harmony and these inserts fit into both easily. Simple installation and they clean well. Effective to adjust any flange. Output is better.

I’d recommend going to a boob specialist for your correct size because if your like me one side might be bigger than the other.

After reading reviews that these are as good as the more expensive brand name parts, I was VERY disappointed to have my pumping result in about HALF the volume as the old parts I was using. If you have a small supply, definitely spring for brand name. Do NOT recommend.