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.