Requested by many speCtra pump users, Maymom develops this special kit just for speCtra users who have medium nipple diameters. <p> Spectra flanges connect only to Spectra bottles, which are not widely available. This Maymom flange kit allow you to use standard-sized bottles on the market. You can use all Madela, Ameda bottles and many other brands of standard bottles (Gerber, Playtex, Nuke, Evenflo) </p> <p> Meeting every customer's needs is Maymom's value of existence. Maymom - Care for Each Mom! </p>