100 % aluminium -The PREVOST PIPING SYSTEM compressed air network range is compact, lightweight and corrosive resistant with all aluminium fittings. The system's installation is quick and easy, then can be pressurized immediately. -Pipes are firmly held in the fitting using the PPS Grip Concept. This new concept is based on a stainless steel ring with teeth that penetrate the aluminium. The new contoured and lubricated seal design guarantees a leak free performance.