フランジインサート – 21mm（2個入り）ウェアラブル搾乳器用、24mmフランジ対応

I was skeptical about whether sizing down would make a real difference, but these inserts fit so snugly into my 24mm flanges that the seal feels seamless. I can finally pump without the constant tugging and chafing, and milk flow seems steadier with the proper alignment.

The 21mm inserts snap into my 24mm flanges perfectly, no wiggling or slipping mid-session. That snugger alignment made a real difference—my output feels more consistent and the pull doesn’t pinch the way it used to.

After two weeks of using these with my 24mm flanges, the 21mm insert finally stopped the nipple rubbing that was making me dread pumping. The softer silicone edge sits flush so there's no gap, and my output is noticeably steadier now. Worth the small swap for the comfort alone.