looks like 8mm microbore inside 10mm sleeve.

[iTRYer]

hmm how to connect this old thin pipe to 15mm, cut it under floor and add 15mm to 10mm flexi elbows and john guest flexi pipe to vales? I have new legs too to cover the pipes. Or use reducers at the valve? either way I need to move the pipes to fit new rad width.

 

[endecotp]

You need something like this, don’t you?

15mm x 8mm Compression Fitting Reducing Set (3 Part)

This fitting reducer is used inside a 15mm compression fitting to let it accept an 8mm pipe

www.stevensonplumbing.co.uk

 

[iTRYer]

Yes think thats it thanks