Kessel Staufix FKA Instructions D'installation Et D'utilisation page 39

Tighten the connector so that the spacer ring connects
flush. If a spacer ring is not fitted, note tightening torque
of 1 Nm.
If the torque is correct, the gap between the nut and
hexagonal body is 1-2 mm, if a spacer ring is not fitted.
Connect the optical probe
Proceed in the same way as for the (backwater flap)
motor, but use the adjacent connector(s).
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