About to put in a shower bar from concealed. I've extended the 15mm pipes, but they don't fit the adapters supplied with the shower bar. Surely they connect like a normal compression joint?
With 15mm pipes sticking out the wall you will need a bat shower fixing kit that slides over the pipe with a compression fitting and the it leaves you with a 3/4” male thread which the shower valve with 3/4” female thread fixes to