What you get: 4 pieces of membranes; after-sales silicone membrane for the Maymom backflow protector (short and long rod) and the Spectra S1/S2 backflow protectors Regularly change silicone diaphragms to optimize the performance of your breast pump Stronger material for improved performance It does not match the old version of the Spectra backflow protector; see photo for details. .
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