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Amazon.com: Maymom Pump Parts Compatible with Spectra S2, S1, 24 mm Flange Tube Bottle Backflow Protector, Not Original Spectra S2 Accessories Replace Spectra Duckbill Valve Spectra Bottle Spectra : Baby
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Maymom Backflow Protector, Long Stem, for Spectra S1, S2 and 9 Pumps to use Medela Flanges and Medela Parts; 2pc - Walmart.com
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Nenesupply 8 pc Duckbill Valves Compatible with Medela and Spectra Pump Parts Use on Spectra S2 Spectra S1 and Medela Pump in St
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