Here are some ways to set up a Spectra to Medela adaptor and use Medela pump parts with your Spectra breast pump.
Maymom adapter for Spectra backflow protectos that come with Spectra S1 pump, S2 Pump and 9 pump to use with Maymom Breastshield (flange) and flange
Maymom Flange Adapter for Spectra S1 Pumps, Spectra S2, Spectra 9 Pump Flanges to be Compatible with Medela Flange Breastshield and Bottles
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How to hack your spectra pump to work with your medela pump parts #spe