The 8 inch diameter high performance vacuum cup is sturdy and durable and can be quickly absorbed on a smooth, flat, non-porous surface. It is very suitable for lifting and moving glass, tiles, refrigerators, furniture, plastics, metals, slate plates and household appliances. Please note that it is not suitable for adsorption on tiles with uneven surfaces. The suction cup is made of high strength and high quality rubber and ABS plastic. The ABS plastic handle of the suction cup is ergonomically shaped, solid and comfortable, and has excellent anti-slip effect. The suction cup has a very strong suction force and can work in the temperature of -20C to 60C and maintain vacuum for 4 hours. The maximum vertical suction force of a single suction cup is 220 pounds The suction cup has been specially developed for curved surfaces. The suction cup offers plenty of space. It can lift curved objects such as bathtubs, washing machines, etc. and can also be used on flat surfaces. All you have to do is place the suction cup on a smooth, non-porous surface or a flat surface. Then pump the vacuum into the suction cup until the red warning line disappears. The indicator''s red line alerts the user that the cushion is losing vacuum. When the red line appears, you only need to use your thumb to pump the plunger without removing the suction cup from the surface of the object, so that the suction cup can firmly grip the surface of the object for a long time.