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Hi. Please can someone help me identify the correct coupling for these two components ? The diameter of the outside of the thread is 13 mm. Suitable to hold household water pressure. Thank you 
What type of coupling is required ?
- Thread starter Dave Foster
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Could you confirm the inner diameter please? What are the components, it looks like it may be a motorised valve (above) and a pump (below)?
Normally plumbing brass fittings in the UK are pretty standard sizes (8, 10, 15, 22, 28, etc... mm) and you may just be able to use a socket:
https://www.toolstation.com/brass-female-socket/p24305 (example of type, needs to be correct size)
or 2x couplers and a short run of copper pipe to join them:
You'll need a bit of PTFE or jointing compound to make sure it's a good seal.
Normally plumbing brass fittings in the UK are pretty standard sizes (8, 10, 15, 22, 28, etc... mm) and you may just be able to use a socket:
https://www.toolstation.com/brass-female-socket/p24305 (example of type, needs to be correct size)
or 2x couplers and a short run of copper pipe to join them:
Brass Couplers Pipe Fittings | Plumbing | Screwfix.com
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You'll need a bit of PTFE or jointing compound to make sure it's a good seal.