Honda EU22i Owner's Manual page 29

4. If two generators were connected for parallel operation, disconnect
the receptacle box for parallel operation after stopping the engines
if you do not wish to resume parallel operation.
If the generator will not be used for a long period of time, refer to
page 57 for information on
RECEPTACLE BOX FOR PARALLEL OPERATION
(optional equipment)
Draining the Fuel Tank and Carburetor
OPERATION
.
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