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 Amanda Mason

Based on my first use. In terms of materials, they are significantly inferior to the original Specter parts, everything is thinner. The biggest difference I think looks in the duck valves. They look a bit odd compared to the originals, but are easier to remove. The suction seemed to be the same. The storage lids are very thick and will hold everything in without leaking. I really like the recesses on the sides of the bottles, they are very comfortable in the hand. The only thing I noticed is that they have an extremely strong chemical smell when you receive them so make sure to wash them well. Not sure how they will perform in the dishwasher as I hand wash all parts and bottles. Seems like a good buy at 1/2 the price. I am an exclusive pump so they will find many uses. I'll test them again in a few weeks to see how they hold up.