Recommendation for expansion tank please

[Cush]

Evening Collective.

As per title, currently looking at a fiama one or seaflo. Only prerequisite is that it works and has half inch threaded connections which make it easier to adapt to my 15 mm water pipes (Is 15mm unusual? Most things I have needed to replace have been 12 mm and need numerous adaptors.)

TIA,
Cush

 

[Cush]

Just FYI, if you are interested. Have gone with one by seaflow from eBay for about £20. If there are any problems I’ll update this. Will be using John guest half inch screw on to 15mm push fit to add to the system.
Cush