UG19 is equivalent to Edwards Ultragrade 19 Oil is which suitable for Edwards RV3 RV5 RV8 RV12 E2M18 & E2M28 Vacuum Pumps. The oil is a triple refined oil for the best possible vacuum. They are also compatible with Varian Alcatel Adixen C1 Galileo Busch R5 (40m^3/hr) FisherScientific Rietschle V Series (40m^3/hr) Precision scientific Leybold Trivac Pfeiffer DUO Line Welch Ulvac Kurt J Lesker and Kinney KVA12-40 Vacuum Pumps.