The Manhole is a working chamber, which is installed at intervals along a pipeline in order to provide access to the pipeline. This is mainly for inspections and maintenance. Special sizes can also be accommodated.

The airport manhole consists of a 1meter chamber section with a 100mm cast in base. This section has a female joint similar to that of the IJ (Interlocking Joint) pipe. The joint itself is used for centering the manhole cover slab during installation.