The PVC pipes used for our tube mail systems have a very low production tolerance with regard to the dimensions and the surface. The pipes are connected by glue rings or steel rings. Approximately 95% of the canal used today is made of PVC because of its relatively simple processing. In certain, mostly public buildings, eg hospitals, the use of stainless steel pipes is mandatory. The pipe network can be installed in the false ceiling or to connect several buildings in the ground or as a free line. Approximately 70% of the newly installed pipe post systems are also integrated into existing buildings.