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BOX55151-K - 4"X4"X1-1/2" 15.0 CU.IN. EXTENSION RING WITH GROUND SCREW Made of steel, this 1-1/2" Extension Ring from Thomas and Betts is designed for use with 4" octagonal boxes. It has a volume capacity of 15 cubic inches and comes complete with ground screw. CSA certified.

Extension ring with ground screw. Concentric Knockouts. 4 in. x 4 in. x 1-1/2 in. 15.0 cu. in.

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