Craftsman 113.177990 Owner's Manual page 11

'16 GALLON WETtDRY VAC MODEL 113.177990
WARNING
SERVICING OF DOUBLE-INSULATED WET/DRY VAC
In a double=insulated Wet/Dry Vac, two systems of insulation are provided instead
of grounding. No grounding means is provided on a double-insulated appliance,
nor should a means for grounding be added. Servicing a double-insulated Wet/Dry
Vac requires extreme care and knowledge of the system, and should b'e done only
by qualified service personnel. Replacement parts for a double-insulated Wet/Dry
Vac must be identical to the parts they replace° Your double-insulated Wet/Dry Vac
is marked with the words "DOUBLE INSULATED" and the symbol _(square
within a square) may also be marked on the appliances.
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