This SF8-JNC1 EMT Fitting Adapter Accessory for the 8" Fire-Rated Poke-Thru from FSR is fitted with one 1" and one 1.5" stub.
The SmartFit 8" series of floor boxes combines flexible options via recessed mounting bracketry and various subplates such as this SF8-JNC1, to accommodate a wide assortment of power, data and audio connection options.