Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 46

6. Mount the CH-30A by sliding the large key-hole slots onto the side
mount shafts.
7. Turn the knurled, side-mount collars counter-clockwise, to pinch the
CH-30A sheet metal chassis within the mount for a secure fit.
8. Connect one end of the pin cable to the socket on the 30-cm column
heater's rear panel.
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Key-hole slots
Knurled side mount collar