The Dew 350 comes with a blue valve and membrane. This serves the same
function as the duckbill valves which come with the other pumps (in fact,
the two are interchangeable, meaning you can use either the silicone duck
valves or the membrane & valve sets with any of your Spectra breastshields).
To assemble, make sure the tab on the underside of the membrane is
inserted into the matching tab on the valve (the half-circle shaped hole).
Press it in all the way.
When assembled correctly, the membrane will lay flat against the valve.
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