Pot for insertion into cast concrete building sections has a ring wall for the opening with a telescopic ring body insert to allow the surface to be plastered straight away

摘要

The pot for insertion into a mold, to form a hollow zone (11) in a cast building section (10), has a ring-shaped wall (6) forming the opening (13) into the hollow zone (11). The ring wall (6) takes an inserted ring body (7), which has a telescope action to increase the length of the ring wall (6).