Review on Nenesupply 24mm Pump Parts for Spectra S2 and Spectra S1 Breast Pumps - Compatible Accessories Flange, Duckbill Valve, Tubing, and Backflow Protector - Replacement parts for Spectra Pump by Kristen Smith

. I bought these for my spectra s2 so will have a second set. I'll start by saying they fit the pump, are functional and have a lot of value. However, I don't fit my chest as well when pumping as the same sized flanges that come with the s2. The plastic seems thicker. Also, when you empty the bottles, some milk gets down your throat, making it very difficult to catch the last drops, and it's liquid gold I don't want to waste. Finally the vent on the bottle which is in the same place as the s2 bottles (under the flange at the lowest point of the cap) seems to be slightly larger than my s2 bottles and I have had leaks there while pumping switching, although I left them in place so they don't print from me. It was a few bucks cheaper than replacing the Specter brands and I wish I could spend those extra bucks just because I don't like them at all.