Dometic CTS 4050 Notice D'utilisation page 31

Place the cassette tank in an upright positi-
on and turn the emptying spout upwards.
Remove the cap from the spout.
CAUTION!
Avoid turning the spout by more than 90°,
as it may otherwise come loose.
CAUTION!
Do not shake the cassette tank violently.
Do not clean the inside of the cassette
tank with a high pressure cleaner.
This can damage the float for the filling
level indicator.
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Fig. 15
Fig. 16
13
Using the toilet
Hold the cassette tank with one hand by
the handle (2) . With the other hand hold it
at the blade handle (3) so that you can ope-
rate the vent button (1) during emptying.
The vent button should only be pressed
once the emptying spout is pointing
downwards. The tank empties evenly and
without squirting.
After emptying, flush the cassette tank tho-
roughly with water. Then make the tank
operational again as described in section
"4.2", before inserting it in the toilet.