Designed for permanent installation in the basement of buildings. They were connected to the various floors through a system of permanent piping concealed within the walls of the building. At various points on each floor were connections to which could be attached the cleaning hose.
In the usual installation, only one cleaning tool could be used at one time. If more than one cleaner tool was to be used at once, two-sweeper or multi-sweeper plants were installed.
- 8 sizes: A,B,B2,C,C2,D,D2,E2
(1940) Connecticut installation