Appleton BU150 Electrical Bushing. Appleton® Conduit Bushing Non-Grounding 1-1/2 in Trade 302 deg F Malleable Iron Zinc Electroplated Finish 2.16 in Dia x 0.63 in H Dimensions. Additional Description: APLE-BU150 1-1/2 IN COND BSHG IRON. Catalog Description: Conduit Bushing Size: 1-1/2 IN Material: Malleable Iron Finish: Zinc Electroplate Connection: Threaded Dimensions: 0.63 IN Height X 2.16 IN Diameter Standard: UL 514B E14814 CSA C22.2 No. 18.3 CSA 065178 NEMA FB-1 For Use With L.