20mm galvanised conduit coupler does the job as needed
thanks to Toolstation for giving this kind of option allowing customer to buy in pieces
Bought this yesterday. Benefit over the completion was you can buy these individually.
These are cheap and cheerful coulers. The finish is a bit rough, but where I used them buried in the wall it made no difference. If they are going to be on show then it's probably best to get the more expensive ones from another supplier.
