a4lod
Guest
My tanks have been fitted with h-valves as I only dive with single tanks. For my first stages I have two SP Mk20's. For my second stages, I have a G500 & a G250. I also have a R190 - which sits at home. After reading my DIR Fundamental's book I read that one of my second stages should be a high performance balanced (I believe this was the term) second stage and the other should be a high performance unbalanced second stage (again I believe this was the term used). If this is true, should I substitute one of my 'G' second stages for the R-190? If so, which one? Please respond. Thanks.