Hi Peeps please can you tedll me how this works? I get its a reducer from 3/4 to 1/2 BUT when I want something to screw on for example the 1/2 inch side what do I look for? Are ther like male/ female screw parts always the same size?
I cnnot see what you are trying to show but the answer is almost certainly yes and available from Screwfix.
The actual catalogue is more useful than the on line search.
If as photo your using a 3/4x1/2 reducing “ socket “ galvanised. The item you want as per the photo is a 1/2” MI x 1/2” MI Male iron x male iron.“ barrel nipple “ or a basic “ nipple “ both will do. Seal each thread with 5-6 complete turns of PTFE.