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Amazon.com : Maymom Backflow Protector Tubing Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Spectra S2 Replacement Parts Replace Spectra Backflow Protector Spectra Tubing Not Original Spectra Pump Parts : Baby
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Amazon.com : PumpMom Backflow Protector and Tubing for Spectra, Replacement Breast Pump Parts for Spectra S1 Spectra S2 Spectra 9 Plus (Not Original Spectra S2 Accessories) : Baby
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PumpMom Backflow Adapter for Spectra S1, Spectra S2 Pump to Use Most Medela Flanges and Bottles; Connects Between Medela Breastshield and Spectra Backflow Protector (Pumpmom Flange Adapter) - Walmart.com
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