Waters Xevo G2-XS QTof Overview And Maintenance Manual page 123

To remove the roughing pump's oil demister element:
1. Use the 6-mm Allen wrench to remove the 4 bolts securing the exhaust
flange to the roughing pump.
Securing bolt
Exhaust flange
2. Using both hands, carefully remove the exhaust flange and oil demister
element from the roughing pump.
Maintaining the Oerlikon Leybold oil-filled roughing pump
Oil demister element
TP02694
TP02693
April 2, 2015, 715004496 Rev. B 123