I replaced the valves on my Spectra S2 pump flanges after about 3.5 months of use (pumping only during work) and I think it works better now than it did brand new! I also replaced the backflow preventer with the nenesupply version at the same time.
Electric breast pump LACTEA Smart Double, beige
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Maymom 15Mm Flange Insert Compatible With Elvie Single/Double Electric, Elvie Stride Cup (24Mm), Compatible With Medela PersonalFit Flex Shield, Not Original Elvie Replacement Pump Parts
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Nenesupply 21Mm Flange Replacement Kit Compatible With Spectra S2/S1 Breast Pumps, Including Ducksbill Valve, Backflow Protector, And Other S2 Accessories And Parts
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๐ฅฆ Sprout Organic Baby Food, Mediterranean Veggie Power Bowl with Beans & Quinoa, 5 Oz Bowl (8 Count) - Ideal for Toddlers & Infants
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