Appleton RB322S Reducing Bushing. O-Z/Gedney Reducing Bushing, Series: RB Series, 1 x 3/4 in Trade, Flush Mounting, Steel, Zinc Electroplated, 23/32 in L Dimensions. Additional Description: APLE-RB322S RDC BSHG STL 1 TO 3/4 FOR NPT. Catalog Description: OZ-Gedney Type RB Reducing Bushing, Size: 1 X 3/4 IN, Steel, Flush Mounting, Finish: Zinc Electroplated, Connection: Tapered NPT Thread, 23/32 IN Body Length, Third Party Certification: UL File Number E-34997, Class I, Division 1, 2, Groups A, B,.