Waters 3100 Operator's Manual page 156

4. Using both hands, carefully remove the exhaust flange and oil demister
element from the roughing pump.
5. Use the 10-mm wrench to remove the nut that secures the oil demister
element to the exhaust flange.
5-96 Maintenance Procedures
Oil demister element
Spring
Securing nut
TP02693
TP02686