Polyhedral composite pipes (PCP) may have in cross-section any shape of a regular or irregular polygon, depending on what PCP intended.

Polygonal composite sections (PCS) can have any cross-sectional shapes in the form of a polygon as close as possible to the cross-sectional shape of the sewer collector in a given place.

Since in many places of the sewer collector its cross-section changes – it goes into expansion or contraction, into chambers or patterns, virtually every PCS is made according to the shape and size of the cross-section of the sewer collector individually for a PCS which will to installed in this place.