SEFRAM 9892 Manuel D'utilisation page 31

(1) Turn off power.
(2) Remove cone cap cover from the tip of snake tube.
(3) Pull out old sensor and insert the new sensor into the plug (see
below Fig.2).
(4) Seal the cap cover over the plug.
Fig.2
(5) When the O-ring is damaged, please replace a new one to
protect the sensor.
(6) When the sensor response is not function well, please replace
a new sensor.
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Détecteur de gaz combustible