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Electrical Junction Boxes
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4" Square Extension Rings
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4" Square Extension Rings
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Garvin Industries 4" Square Extension Rings are 1-1/2" & 2-1/8" deep and offer 1/2", 3/4" & 1" conduit knockouts. These extension rings are used when extra cubic inch capacity is needed for additional wiring. They are made from rugged galvanized steel. Chicago Plenum Extension Rings have "air tight" knockouts and do not come with captivated box screws.
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