continental rad valve?

[John t]

Customer has a radiator valve with a compression fitting for a (what looks and feels like) a 16mm pipe, been told by plumbing merchant 16mm is a continental size. Problem is I need a seal/fitting to take up the extra 1mm, any ideas on a supplier. Worst senario he'll have to buy new rad valves but as yet haven't double checked the thread connecting to the rad,
thanks for reading

 

[crashndie]

is it not 15m soft copper it comes on a roll like 10mm pipe does. only thing i can think of is a 1/2 to 15mm end feed coupling the old style copper pipe had a thicker outer wall so may get away with it ?? second idea is use a drift of flearing tool to widen a piece of 15mm and slip the 16mm inside it an solder it