For Increasing demands for example high requirements regarding cleanness when pumping high quality media which must not be contaminated by other media for recycling, often requires the use of universal pumps where the pump chamber is free of operating agents (dry pumps). Leybold Vacuum offers two solutions: 1. Pump systems with dry compressing vacuum pumps combined with one or several Roots vacuum pumps. 2. Single or multistage RUTA RAV vacuum pump systems, consisting of Roots vacuum pumps with pre-admission cooling.