What type of hub is used with an OCK400 Overhead Trough?

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What type of hub is used with an OCK400 overhead trough?

Issue:
Selection

Product Line:
CSED

Resolution:
The top endwall is provided with a hub opening, accepting a field installed "A-L" type of hub. A-L type hubs are available for 2" thru 4" conduit.
2" = A200L
2.5" = A250L
3" = A300L
3.5" = A350L
4" = A400L
There is a concentric knockout pattern in the lower, right side wall for user supplied conduit to route the conductors into the CSED device. The knockout pattern is for 2.5", 3", 3.5" and 4" generic conduit hubs.