URL: https://www.desy.de/school/school_lab/zeuthen_site/vacuum_lab/vacuum_information/applications/plunger/index_eng.html
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Plunger
If you want to do without chemical aids when cleaning the drain, a "plunger" can be used. Small suction cups (towel rails) are also used to attach hooks to the wall. The larger suction cups are used to hold devices on the worktop. A further application is the suction lifter, with which e.g. glass or stone plates can be transported.