Shower bar adapter doesn't fit 15mm pipe

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?

Advice from 3 local tradespeople

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

No normally the connections are bsp

They need to be 15mm pipe with 150mm Centers

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