Spectra Pump Compatibility：compatible for Spectra S1, S2, 9 Plus, and Synergy Gold breast pumps, Complete Replacement Kit content:4 Flanges (34mm), 4 Duckbill Valves, 4 Backflow Protectors, 4 Tubes, and 4 Bottles,easy use whether you’re a first-time mom or a seasoned pro Durable & Built...

Spectra Pump Compatibility：compatible for Spectra S1, S2, 9 Plus, and Synergy Gold breast pumps, Complete Replacement Kit content:2 Flanges (20mm), 2 Duckbill Valves, 2 Backflow Protectors, 2 Tubes, and 2 Bottles,easy use whether you’re a first-time mom or a seasoned pro Durable & Built...