Eastman Outdoors Reveo Food Processor/Tumbler - Manual (Page 13)

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Once the MariVac process is complete, turn the pressure valve dial (on top
of the lid) one quarter turn toward “Tumble Close” position and remove the
vacuum hose. Gently lift up on the lid while holding the barrel. If the barrel
is properly vacuum-sealed for tumbling, the lid will NOT come off. If the lid
does come off, repeat Step 3 until it is sealed and will not come off.
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