Im going to stoney at weekend but just incase i forget..... which cylinder(s) should i get to twin up with? I already have a faber 12 ltr steel and its 12s i want on twinset but should i go for twin faber steel ie add one to my current cylinder to make it twins 21% (air).... or new twin steel O2 clean for mixes of more than 21% air ie nitrox? also any idea as to wether to go to twin alu (nitrox). Pros and cons re DIR configuration. Also any preference and why beaver or faber. I know from a friend that beaver do good cylinders O2Clean, but send cylinder and valve separate and when put together (as the valve is not sent O2 clean) ,m
akes the set up not O2 clean,seems a bit suss to me.