Wolf MGK-130 Instructions Manual page 8

Conversion to G31
c) Undo the screws between the gas pipe and the
GCV (4 screws).
d) Undo the GCV from the mixer (4 screws).
e) Remove the gas restrictor.
For G20 and G31
Fit suitable restrictor with O-ring 23.47 x 2.62 into
GCV.
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