By means of a suitable Allen key, unscrew and
remove the intake filter (see picture).
The intake filter of the ZB valve block can be
unlocked by hand, without tools.
Clean or replace the intake filter.
The filter (see picture) can be blown out with
compressed air, but it is strongly recommended
to replace it with a new one.
The part number of the filter can be found on
the recommended spare part list.
Before ordering, make sure to which Venturi
valve block the filter has to fit (ZA or ZB).
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