Instructables

Step 18: Flip The Valve

Slide the white gasket piece straight up then and flip it over 180 degrees and put it back in.  It sticks a little the first time you slide it out, so give it some pressure and careful to not bend back your nail when it finally goes.  Make sure you remember to flip the other side after doing this one or only one side will be change to a vacuum.
 
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