In underground applications where channels are dug to ensure that corrugated pipes and fittings serve for a long time without any problems; when filling the channel, it should be compacted in layers so that there are no weak spots around the pipes. 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 any problems throughout its life. If compaction is not done well, there is a risk of collapse because the pipe cannot transfer the load it is exposed to to other forces due to the voids that will form. Corrugated pipes and fittings are produced from ø 100-1000mm HDPE raw material. They are produced in various diameters and are quickly installed with gasketed joint control. They are easily used in sewage, domestic and industrial waste disposal; rainwater discharge and drainage water transport lines. Thanks to its flexible structure, it is not affected by earthquakes and seismic movements. Corrugated pipes ensure the trouble-free operation of infrastructure pipe systems with a 50-year service life. Soil compaction during the laying of corrugated pipes extends the life of the system, and filling the soil with backfill material during laying is very important.