If you need the full accessories for the Spectra pump, this kit is great! If you already have the bottles and tubing, but need to replace your valve and duckbills you can purchase those separately. Amazon also sells attachment converter pieces if you wants to used these bottles with a Medela pump, or M bottles with the S pump.

Love that Spectra carries my size in pump flange! Do wish they offered glass bottle alternatives!

Covers everything you need! When I crushed the back flow protector recently it made more sense to purchase this pack than one protector.