Small cap bottle adaptors are for use with Spectra wide neck shields to make them compatible with standard or narrow neck bottles such as Medela, Dr Brown's, etc.
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These adaptors fit on narrow necked bottles with a Spectra brand wide-neck shield so you can pump directly into your bottles. If you are double pumping, be sure to order two separate adapters.
Review by KRISTIN G. on 2 Dec 2022review stating Fits Dr. Brown’s
I use Dr. Brown’s bottles for my baby so I like to pump into one “pump” bottle and one Dr. Brown’s bottle then combine in the Dr. Brown’s. This adapter works perfectly! You just screw it onto the flange and onto the bottle and it is a tight seal. Dishwasher safe too.