2 Al Knockout Hub

PVC coated ST knockout hubs are used to terminate conduit runs through the wall of a sheet metal electrical enclosure. Available as STG with a grounding lug. PVC coated STTB hubs are "Through-Bulkhead" fittings used to pass conduit runs through firewalls or bulkheads up to 1/8" thick, and STTTB (furnished without nipples) offered for unlimited thickness.