Most breast pump brands come with a standard 24 mm tunnel diameter. (expressing-mama.com)
When I first decided to breastfeed I had no clue where to start, what pump brand to go with, or how to turn one on. (mygreennest.com)
Or, the mom who admitted to me that she uses a breastfeeding pump brand of bottle for her formula, so that people will assume it is pumped breastmilk. (huffingtonpost.com)