The part numbers for the brass reducers are 1235NPT4
Our comprehensive range of Screw'ed Metal Conduit Fittings specifically designed for heavy duty installations. To minimise corrosion the fittings ore either made from brass. galvanlsed cost or zinc plaled sleel. All are manufactured to exacting Clipsal standards and controls.and comply with AS2052. Unless otherwise stated, fittings have Metric Conduit Threads.
has a 35mm width acrss Flats and a NPT to metric thread.
has a 36mm outside diameter and a BSP to metric thread.
1235NPT4 Conduit Adaptor, Brass, 1-11-1/2 x M20x1.5, MNPT to Female
1242BSP25/20 Conduit Coupling, Brass, 1-11 x M20x1.5, Female BSP to Female