Place the suction cup on a smooth surface without water or oil and press the suction pump firmly to suck out the air. Press the pumping valve quickly and vigorously so that the suction cups quickly create vacuum pressure to attach to the object. Until the red safety line of the air pump disappears completely, it is safe to work. (Note: It is not possible to press the air pump slowly) When the work is finished, grasp the edge of the suction cup and remove the suction cup directly. Double-layer design The glass suction cups are upgraded with a double layer of thickened rubber for stronger and more durable suction. Red warning line The thoughtful design of the safety red line allows us to keep an eye on the suction cups for air leakage, making our work safer. Two removal methods When the work is finished, just press the bleed valve or pull the release tab for quick release. For maintenance When not in use, keep the adsorption surface clean and tidy, cover it with the original protective cover, and place it in a dry place. dry and cool. Note: Extremely low and high temperatures can affect rubber performance.