Be careful.

Disc by atmospheric pressure to fixed on the wall? so thewall more stringent requirements? must be absolutelysmooth and no leakage of the wall can be installed? sowhen you buy must pay attention to check whether theirlocation to install to install suckers. If you want to installwall can not install suckers? can buy the shop assistantversion of KM2017 with chuck chuck auxiliary plate? the sucker is arranged in the auxiliary plate? solved.