About this item The difference between the classic suction cup and the super suction cup: the super suction cup has a layer of black MOS polymer soft sealing material, which automatically fills the rough gap inside a 1mm space, turn the lock and you don't have to worry about it falling off. Advantages: 5 seconds quick installation, 8 years of adsorption long lasting, moisture and water resistant, not afraid of temperature changes. Automatically fills the rough surface within one millimeter of the dent (very powerful function), increases adsorption by 2-3 times, unique 60 degree locking design. Machine washable with tap water, repeated use. No need to drill, nail, glue, waterproof and moisture-proof, very strong adsorption force, can be disassembled and reused, and no problem in humid environment. > Immediate locking the vacuum cleaner, you can use it indefinitely. You can also do "one spin recovery" factory setting. Like new, turn it gently and listen to the sound, and the vacuum cleaner is locked! Just vacuum, lifting is no longer a problem, turn left, press, then right, start to restore original factory settings, also known as vacuum settings, like new.