Yes, however the alternatives may vary in style, material or number of entries.
The closest alternative in galvanised cast iron is a Junction Box, Round- 20mm I.D, 1 Way Entry, Heavy Duty. The Part number is 1239H20/1
The closest alternative in PVC is a Junction and Adaptable Boxes PVC- 20mm Entries, 1 Way. The partn number is 240/20/1
For further information please visit https://www.clipsal.com/Trade/searchround/jbox20MMENTRY1
1239/20/1 1239H20/1 240/20/1