These are the hand cups chosen by professional glaziers around the world. Powr-Grip hand cups are also used for lifting and carrying a variety of smooth, nonporous stone products. Quality construction, close attention to detail during manufacturing, and individual testing have given these tools a reputation for excellence. Unlike suction cups that produce a vacuum when they are pulled away from the glass, Powr-Grip vacuum cups pump out air from between the rubber pad and the glass surface, thus creating a much more reliable hold. Because the full face of a flat, rubber pad is brought into contact with the glass surface, glass distortion is reduced.
Less distortion allows the cup to be used on almost any glass thickness.
A red line on the plunger indicates the vacuum level of the hand cup. When the cup is attached completely, the plunger is partially hidden inside the pump and the red line is not visible. A visible red line indicates vacuum is not sufficient for a lift. If the red line starts to show during a lift, a check valve allows the operator to repump the cup without losing the remaining vacuum. When the lift is completed, a release device allows air to refill the evacuated space, so that release is complete, with no dangerous after-stick.