Cleaning pipe for fitting into pipe, has maintenance pit with multiple circulating seal collars, which are held detachably in seal seats for fluid seal connection of maintenance pit at base plate

摘要

The pipe has a base (2) for receiving a back log seal. A maintenance pit (10) includes multiple circulating seal seats (14) and circulating seal collars at its external wall (11) in different positions along its pit axis. The circulating seal collars are held detachably in the seal seat for fluid seal connection of the maintenance pit at a base plate (30). The seal seat is designed on an external wall of the maintenance pit receiver.