The PP Devacontrol should be placed completely level on a 100% stable surface. The pipes to and from the Devacontrol should be connected at the right incline. The Devacontrol can be elevated using a pipe with a diameter of 315. The Devacontrol and elevation pipe should be filled and compressed step by step.
Filling and compressing should be carried out using pure filler sand. The cover should rest on the surface around the Devacontrol and certainly never on the elevation pipe. Ideally, the cover should be placed on a concrete rim, so that loads are not applied to the Devacontrol by traffic.