The  connection to the  required assembly lengths is carried out on the  construction site either by connecting individual pipes whose both ends are  sealed with  steel lids against the  intrusion of concrete (finished assemblies) or by connecting the  individual pipes with  plug-in sockets, with  only the  first and the  last pipe of the  line being sealed with  a lid (connected assemblies). Lines which consist of connected assemblies allow for  the  laying of supply lines through the  hollow bodies.

Instead of sealing the pipes with steel lids, equipment with conical seals is possible. The implemented reduction of the pipe end lengths avoid undesired notch tensions.

A ventilation system for the individual pipes, or a joint ventilation of the pipe line can be provided or prepared by the manufacturer for the purpose of ventilation or drainage of the pipe lines.

If the displacement pipes are to be secured against lift, it is recommendable to apply the specifically developed Hydra single and double anchoring elements. They are tested for their static properties and guarantee utmost avoidance of showings, above all of rust stains at the bottom of the ceiling. The  different assembling and disassembling methods of the supports allow for compliance with  the  individual requirements in the individual structures. it is possible to install and to remove the lift prevention locks exclusively from above, if this should be very difficult or impossible from below, due to the specific conditions.