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Amazon.com : Spectra - Backflow Protector Replacement Part for Breast Milk Pump - Breastfeeding Support Essential - Compatible with Spectra Breast Pumps : Baby
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LactConnect Breastfeeding Blog: Troubleshooting your Spectra Breast Pump: Backflow Protector & Duckbill Valve
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Amazon.com : Nenesupply 5 pc Duckbill Valves Compatible with Medela and Spectra Pump Parts Use on Spectra S2 Spectra S1 and Pump in Style Harmony Symphony Replace Spectra Duckbill Valves and Medela
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