Metrohm 823 Membrane Pump Unit - Manual (Page 17)

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3 Installation
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2 Connect the tubings to the tubing olives of the pump tubing using
union nuts.
Figure 3 Connecting the tubings
Note
To fasten PTFE tubings in place, you have to widen their openings
(e.g. using a Phillips screwdriver). You can use a piece of sandpa-
per to make the PTFE tubing easier to handle.
3 Screw the union nuts tightly to ensure a secure tubing connection.
Figure 4 Screwing the union nuts tightly