UG20 oil is equivalent to Ultragrade 20 Oil is suitable for all Edwards EH Booster Vacuum Pumps.The oil in boosters is of lesser viscosity then the alternate grades. The oil are also compatible with Stokes series Boosters Busch Panda/Puma Busch R5 >100m^3/hr Rietschle R Series Boosters Pfeiffer Okta Line & Leybold RUVAC series & Kinney KMBD Booster Vacuum Pumps.