10mm/15mm thermostatic valves?

[Smileysmile]

I have a chrome towel rail for my downstairs loo.
The pipes coming out of the wall are 10mm microbore.

Now I am confused. A lot of the TRV are 15mm yet I see 10mm TRV.
So is this saying I don't need a reducer with the 10mm TRV and it will fit right onto the 10mm microbore pipes?

Or get the 15mm TRV and have a reducer fitted to fit the 10mm pipes?

Here is the link to what I like. Has to be corner (angle) TRV so fits neatly under the towel rail.

http://www.designerbathroomstore.co...W3TAEDbqBc6KE_O1F2rnzZqT3_-X8FLUGahoC86rw_wcB

This is cheaper. But this one is more expensive. I need a little help in deciding guys. Thanks

http://www.tradeplumbing.co.uk/trc-corner-ideal-trv-valve-white-vvcoidtrv-chrome.html

Just thought about this. Why am I putting TRV in downstairs loo?

For a fraction of the price why don't I go for these?

http://www.amazon.co.uk/Round-Corne...1293255&sr=8-1&keywords=corner+radiator+valve

My question still applies to the 10mm to 15mm valve sizes. I appreciate any feedback

 

[sooey]

A 15 mm TRV will need a reducer, a 10 mm TRV won't.