Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange to Use Medela Bottle, Ameda Bottle

4x 3rd Generation Genuine Maymom bottle size changer includes an anti-leaking & anti slip o-ring; designed to avoid leaking when a mother bent over during pumping, reduced chance for a unscrewed bottle, no interfering with the duckbill, and easier screw on to both the widemouth flanges and the standard-sized bottles

Allow Avent and Spectra S1 and Spectra S2 flanges to use with standard sized bottles like medela bottles, ameda bottles (narrow mouth) and original Dr. Brown Bottles (note will not fit wide mouth Dr. brown bottle) to replace the wide mouth spectra bottles.

We recommend that you use a bottle-stand (such as ASIN B00PRPLRYQ) as well to reduce the tipping-over of the bottle.

BPA free, dishwasher safe; FDA compliant for food contacts. Every batch is tested for safety. Test reports are online on Maymom's website for your reference.

From a brand you can trust - Maymom and USA based customer service.