T&B threaded enlargers are used to adapt an outlet hole to the next larger size of conduit. The offset nipples provide box to box connection of knockouts and allows misaligned knockout connection by rolling the offset nipple until aligned with each knockout. Bushed nipples are used through knockouts to connect box to conduit coupling. They can be used with a locknut to connect two boxes side by side or back to back or to connect fixture housings and continuous runs.