Maymom Baby Bottle Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pumps' Wide Mouth Flanges to use Medela Bottles, Ameda Bottles, Lifefactory Bottles, Dr. Brown Narrow Neck Bottles, 4pc https://smile.amazon.com/dp/B01EUNA96W/ref=cm_sw_r_cp_api_glt_fabc_H3Z0X1E9Y927NYCVXG6Z
Maymom Baby Bottle Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pumps' Wide Mouth Flanges to use Medela Bottles, Ameda Bottles, Lifefactory Bottles, Dr. Brown Narrow Neck Bottles, 4pc https://smile.amazon.com/dp/B01EUNA96W/ref=cm_sw_r_cp_api_glt_fabc_H3Z0X1E9Y927NYCVXG6Z
That’s what I have!