Servicing PCV/ Purge Valve

[5olid]

Hi All,

I've recently bought at 2010 Abarth 500 and have to sort a few things on it.  I believe my purge valve (PCV) in the oil/air separator box needs replacing.
This: https://www.youtube.com/watch?edufilter=NULL&v=1OMEfjVB3JU

I'm aware that you can buy the PCV and O-ring required by its self however they are not fiat parts & not sold by Fiat. Would anyone know where in the UK i could buy this & what the part number is?

Dealer parts suppliers only sell the whole black box which is £££, which i want to avoid as i don't need the whole box.

Thanks in advance