Among the safest hand vacuum cups available on the market today. These specially designed, hand actuated cups operate on a pump system, and create a vacuum under their gripping pad section. The pump plunger had a red band to indicate suction level at all times. When it shows 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. These cups come with a release valve guard to prevent accidental loss of vacuum
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