GE AKTA avant User Manual page 341

Step
3
4
5
6
ÄKTA avant User Manual 29035184 AE
Action
Remove the outer locking O-ring from the top section.
Lift up the top section of the Mixer and pull away the old O-ring inside.
Wet the new O-ring with 20% ethanol and fit it in position. Make sure that
the inline filter is still in position.
Reassemble the Mixer components and, while holding the Mixer upright,
screw the top section back onto the Mixer.
7.8 Replacement procedures
7.8.3 Replace the O-ring inside the Mixer
7 Maintenance
341