When displaying less than 100% vacuum left, simply pump the plunger until you reach the original vacuum pressure without removing the cup from the glass! To release, just depress a trigger on the opposite end of the handle from the plunger. Never exceed the recommended weight limit of this cup. CAUTION: Cups must be kept clean and stored in carrying case when not in use.
IMPORTANT: Small cuts cause leaks.
For detailed instructions directly from the manufacturer, please visit Wood's Powr-Grip W6450. Note: manufacturer's sku is N6450.