Okay, so I've been using these LOZAEVE flange inserts for about a month now and WOW - what a difference they make!

First off, the compatibility is insane. They fit perfectly in my Momcozy S12 Pro AND my friend's Spectra pump when she borrowed one. No leaks, no weird gaps - just snug and secure.

The size options saved my life (and my nipples)! I started with 19mm but noticed my size changed after a few weeks. Having all these sizes in one pack meant I could adjust without waiting for new parts to arrive.

Pro tip: The material is super soft but durable. I was worried about cleaning at first, but they rinse clean super easily. Just don't microwave them too long like I did once - oops!

The only con? That weird silicone smell when they first arrived. It went away after a good wash though.

Seriously, if you're struggling with flange fit or output issues, try these! My pumping sessions went from painful to productive almost overnight.