Cleaning cover which fits outside a Safe fitting.
The cover is held in place by spring clips against the inside of the Safe fitting. This does not apply to Ø400 which is held in place by two eccentric locks.
The cover is loosened by pulling it straight outwards, and is installed in the opposite manner (but not Ø400). There are one or two handles to help in the process.
Dp in the table gives the maximum positive pressure the cleaning cover can withstand when installed from beneath.