Kessel Staufix FKA Instructions De Pose Et D'utilisation page 35

6.3.2 Maintenance
Unlock the quick-release closures, this slightly raises the
lockable cover.
Dismantle both lockable covers, lifting the side facing
away from the sewer first.
Remove the flap holders from the flaps and dismantle the
flaps.
Remove dirt and deposits on flaps, insertion parts and on
the interior of the drain body.
Check the components and their seals for damage.
Replace damaged components.
Assemble the components again in reverse order.
✓ Carry out functional test on the flaps by actuating the
emergency closure lever and the "flap" button again.
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