10mm copper tube is easily damaged. 10mm plastic pipe is tough, and won't be easily damaged.
I've done exactly as was suggested by 'gasmanrob' and not had an issue. Sure it's not ideal, but as he says - look at the opening on some rad valves. The appature on some is about 8mm.
You can't just throw 10mm everywhere and hope it works!!
But in this instance I think you'll be fine.
Also you can buy purpose made inset boxes from Toolstation to direct the pipe. A single patress with grommets is a good idea, but these things are purpose made.
I've done exactly as was suggested by 'gasmanrob' and not had an issue. Sure it's not ideal, but as he says - look at the opening on some rad valves. The appature on some is about 8mm.
You can't just throw 10mm everywhere and hope it works!!
But in this instance I think you'll be fine.
Also you can buy purpose made inset boxes from Toolstation to direct the pipe. A single patress with grommets is a good idea, but these things are purpose made.