Flange adapter to connect between a spectra backflow protector and Maymom breastshields. Also works with the major leading brandu0026#39;s breastshield connectors and spectra backflow protectors.nMade of PP (BPA free).nMaymom adapter for Spectra backflow protectos that come with Spectra S1 pump, S2 Pump and 9 pump to use with Maymom Breastshield (flange) and flange connector from a major brand.