All new regs on the market today are rated for 40% Nitrox...just an FYI.
I think a more accurate statement is that all regulators that state they are rated for 40% are. Posiedon makes one, for example, that is not. As I have found out over the years, things you "assume" are not always the case. One of my aqualung pressure gauges used buta orings.. and when I asked about it, was informed if they say it is rated for nitrox it is, if they don't it isn't. I assumed it was rated for nitrox.. it wasn't.