the world > physical sensation > cleanness and dirtiness > clearing of refuse matter > [noun] > clearing drain or sewer > device for (3)
(a) = gridiron, n.; (b) see quot. 1750.
A thing which plunges or may be plunged; esp. an instrument or part of a mechanism which works or is… Plumbing. A device consisting of a flexible…
a rubber cup attached to a handle which by creating a vacuum in a blocked drain is used to clear it.