Hoosier
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DA Aquamaster:The R190 is still on the US site along with the R295 but the R390 is not. And the R295 is a compact R390 ish regulator but without an adjustable flow vave.
The R290 is on the UK site and is billed as a compact version of the R190 - which I find confusing as that is exactly what an R390 is, and of course the R390 is still on the UK site.
Consequently, in the US you can have an unbalanced downstream poppet second stage in the "normal" R190 size with it's full sized diaphragm and an adjustable flow vane. Or you can have it in a small, ugly purge covered version without the adjustable flow vane. So if you want small size, you have to accept even more compromises than before (ie: you get no adjustable flow vane like you did on the R390).
In the UK, you can have an unbalanced downstream poppet second stage in the compact R390 size and with an adjustable flow vane. Or you can just get the original R390 with it's small size and...of course...an adjustable flow vave.
So in the US, you have to have the large size or go all the way up to the balanced S550 to get an adjustable flow vane.
While in the UK, you can buy what is from a feature standpoint, the same reg but with a different number and purge cover.
It makes no sense to me. The R190 and R390 choices worked great because they offerred the same full features, just in different sizes. And if you did not want to use the adjustable flow vane, you could just leave it set in one place.
Thanks for your great review.... I don't look at the schematics, so I am not sure how much internal parts are different each other though (apparently R190/R290 looks like sharing the same parts).... R190 with an adjustable vane really works great. I feel like it is just market strategy to change the number and size periodically.