The pneumatic dispatch tube is a PVC-Tube with very tight production tolerance in regards to the measurement and surface. The tube is joined with glue sleeves or steel sleeves. PVC tubing is the prefered material in approx. 95% of today's applications. PVC is lover cost and offers a range of other installation benefits. In some applications, such as hospitals and other public facilities, the use of high-grade steel tubing is specified. Steel tubing is more expensive than its PVC equivalent. Approx. 70% of today's installations require integration into existing facilities and can run underground or overhead, or in the false ceiling network several buildings adjacent at on another.