Breast Pump Compatibility: Spectra backflow protector compatible with Spectra S1, S2, 9 Plus and Synergy Gold electric breast pumps Easy to Clean Baby Feeding Supplies: Wash Spectra pump part after each use with warm soapy water and rinse well Barrier for Safe Breast Feeding: Creates a physical barrier, ensuring your breast milk is free of contaminates and prevents it from going into the breast pump motor These have not been used but are not in original package.