To ensure that corrugated pipes and fittings of 100, 150, 200, 250, 300, 350, 400, 500, 600, 700, and 800 mm serve for a long time without problems in underground applications where channels are dug, the backfill around the pipes must be compacted in layers to avoid weak spots. Filling the underside of the pipes with backfill material is particularly important. If the filling process is carried out according to specifications and thoroughly compacted, the traffic and soil load on the pipe will be partially transferred to the backfill, and the pipe will perform its duty without problems throughout its life. If compaction is not done well, the pipe may be affected. Corrugated pipes and fittings are produced from HDPE raw material in diameters of ø 100-1000mm and are installed with gasketed joints. They are easily used in the disposal of sewage, domestic and industrial waste, as well as in rainwater discharge and drainage water transport lines. Thanks to their flexible structure, they are not affected by earthquakes and seismic movements.