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 within 1mm gap, rotate the lock and no longer have to worry about it falling off. Advantages: Quick installation in 5 seconds, 8 years of adsorption of long lasting, moisture and water resistant, not afraid of temperature changes. Automatically fills the rough surface within a millimeter of the dent (very powerful feature), 2-3 times increase in adsorption, unique 60 degree locking design. Can be machine washed tap water, repeated use. No need for punching, nailing, gluing, waterproof and moisture resistance, very strong adsorption force, can be disassembled and reused, and there is no no problem in humid environment. Immediately lock the vacuum cleaner, you can use it indefinitely. You can also perform the factory setting one-turn recovery. Just like new, turn it gently and hear the sound, and the vacuum is locked Just suck, lift is no longer a problem, turn left, press, then right, start to restore original factory settings, also known as vacuum setting, just like new.