Review on Maymom MyFit 19mm Flange Set with Widemouth Connector, 3rd Generation Duckbill Valve - Compatible with Spectra S2, Spectra S1 - Non-Original Accessories for Spectra S2 Pump - Not OEM Spectra Pump Parts - Spectra Flange and Valve Combo by Sara Lutz

Fits perfectly on my Spectra S2 and does not leak. I love that it comes with a set of duckbill valves. It's always nice to have an extra set so I don't have to run to the store to buy a new one if one of them stops sucking. It's nice that it can be taken apart to fit my pump bra as some pump bras don't allow you to insert the entire flange. Very versatile in that regard. In general, everything corresponds to the seller's description. Good quality at a good price. Also, at 19mm, it's difficult to find a suitable flange. Works perfectly! No complaints here!