Hkoenig BW1890 Manuel D'utilisation page 27

B. TO CHANGE BEER TUBE (show as figure 33)
Please replace the beer tube if beer tube is damaged and cause
beer leakage.
Loose out the tube from the connection 1, draw out the tube.
1.
Pull down the lock setting, and draw the tube out.
Screw out nut at connection 2, and draw the tube out.
2.
Replace a new beer tube, and install the beer tube according
3.
with reverse procedure.
NOTES: Don't move other screws when processing tube
replacement, otherwise, it may cause the beer leakage or gas
leakage
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Lock setting
Connector nut
Figure 33