Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 34

23. Push the 25-pin cable into the socket on the back of the column heater,
and then tighten the thumbscrews to secure the cable to the socket.
24. If you installed the optional leak sensor, plug the connector into the
receptacle located behind the column heater.
25. Swing the column heater into the operating position.
26. Push the drain tubing onto the barbed drain fitting on the left-hand side
of the MS-bracket drip tray, and route it to a suitable waste container.
27. Open the column heater door.
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Thumbscrews
Location of leak sensor
receptacle