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If the two inlet pipes are tightened in the photo, there's a difference in the threads showing under the compression nuts. The left middle union looks like the inline coupler below it, whilst the bottom union has almost no threads showing.
As Sumo questions, does the bottom one have an olive? If so, have you over tightened it and crushed the copper pipe.
user69121
More shower questions, apologies.
I'm fitting this unit and the inlets won't seal properly. I've boshed a load of water hawk in there which improved it but hasn't fixed it. Everywhere I've read said that should fix it.
The washer can't sit under the threads like you see on a flexi hose etc, the inlet is like a half-moon going into the unit; it has to go over the threads. I spent far too long trying all the different washers available at Screwfix to no avail, they're all sized at OD.
It's two G¾" inlets. The G½" outlet seems to be fine.