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Amazon.com : PumpMom 24mm Breast Shields Breast Pump Flanges for Medela, Replace Flange Compatible with Medela Breast Pumps Personalfit Flex Breast Shields, 2pcs (Not Original Medela Pump Parts) : Baby
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LactConnect Breastfeeding Blog: Breast Sheild Size - How Your Breast Pump Flange Affects Your Milk Supply
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Spectra Baby USA - Breast Shield Flange - Medium (24mm) - for 9 Plus, S2, S1, M1 Breast Pumps - Walmart.com
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