Maymom 3rd Gen Thread Changer or Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange Compatible, No Leak, Fallen Bottle

The original Maymom bottle size changer of the 3rd Generation features an O-ring to prevent leakage and slipping; it is designed to prevent leakage when the nut bends during pumping, and to reduce the possibility of unscrewing the bottle out so as not to obstruct the duck spout and to facilitate screwing to both the wide neck flanges and standard sized bottles. Allows you to use the flanges and Spectra S1 and Spectra S2 with standard size bottles such as bottles, ameda bottles and original Dr. Brown bottles (note: does not fit the Dr. Brown wide mouth bottles) to replace the wide neck spectrum bottles. We also recommend using a bottle stand (e.g. ASIN B00PRPLRYQ) to reduce the bottle tipping over. BPA free, dishwasher safe; FDA compliant for food contact Each game is tested for their safety. The test reports are available on the Maymom website for your information. From a brand you can trust - Maymom and USA based customer service.