Use this Nozzle reducer to convert your older lamp to fit a modern standard-sized finial. Simply screw the 18 IP female end over your existing 38 inch outside diameter rod then screw into your 14- 27M male end 14 outside diameter into your standard sized threaded finial. Use this Nozzle reducer to convert your older lamp to fit a modern standard-sized finial. Simply screw the 18 IP female end over your existing 38 inch outside diameter rod then screw into your 14- 27M male end 14 outside diameter into your standard sized threaded finial.