The FBS133 KO adapter plate has three concentric knockouts for 1/2” and 3/4” conduits.
When a service divider is installed on the PF10266B, the box is divided in two compartments (1/3 + 2/3). Two knockouts are positioned to feed the 2/3 (bigger) compartment and one knockout to feed the 1/3 (smaller) compartment.
To be used only with the PF10266B.
