Kwikon Threaded Male Adapters easily create connections between ENT and slab boxes with knockouts. Residential (Low or High Rise) Commercial (Low or High rise) Institutional (Prisons Schools Universities) Hospitals and Nursing Homes (only in nonpatient care areas) Stadiums and Arenas Six locking tab design for a strong, concrete-tight connection Threaded end easily connects ENT to slab boxes with knockout hubs Supplied with locknuts