Square Boxes & Extensions

4" X 4", 1 1/2" deep, 21.0" cubic capacity

52151-K Concentric conduit knockouts (6). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	52151-KSB Side bracket. Concentric conduit knockouts (4). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	52151-MSB Steel stud bracket and support. Concentric conduit knockouts (2) 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.

52151-MSBS Same unit as 52151-MSB (above) with 1 5/8” - 3” stud bracket.	53151-K Extension ring. Concentric conduit knockouts (6). 1/2" conduit knockouts (4). Raised ground screw.
4" X 4", 2 1/8" deep, 30.0" cubic capacity.

52171-1 1" conduit knockouts (4). 1/2" conduit knockouts (2). 3/4" conduit knockouts (2). Raised ground screw.	52171-K Concentric conduit knockouts (6). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw. Concentric conduit knockouts (6). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	52171-KSB Side bracket. Concentric conduit knockouts (4). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.

52171-MSB Steel stud bracket and support. Concentric conduit knockouts (2). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	53171-ER Extension ring for concrete rings. Concentric conduit knockouts (6). 1/2” conduit knockouts (4). Raised ground screw.	53171-K Extension ring. Concentric conduit knockouts (6). 1/2" conduit knockouts (4). Raised ground screw.
4 11/16" X 4 11/16", 1 1/2" deep, 30.0" cubic capacity

72151-K Concentric conduit knockouts (6). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	73151-K Extension ring. Concentric conduit knockouts (6). 1/2" conduit knockouts (4). Raised ground screw.
4 11/16" X 4 11/16", 2 1/8" deep, 42.0" cubic capacity

72171-1 1" conduit knockouts (8). 1/2" conduit knockouts (2). 3/4" conduit knockouts (2). Raised ground screw.	72171-K Concentric conduit knockouts (6). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	72171-KSB Side bracket. Concentric conduit knockouts (4). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.

72171-MSB Steel stud bracket and support. Concentric conduit knockouts (2). 1/2" conduit knockouts (6). 3/4" conduit knockouts (2). Raised ground screw.	73171-K Extension ring. Concentric conduit knockouts (6). 1/2" conduit knockouts (4). Raised ground screw.