Originally Posted by john61ct
Yes you're right, for horizontal use just rotate in the bracket, index-hole UP will give vapor output
Actually this will not be safe, the fixed-level spitter valve and safety pressure relief both need to be up at the top in the vapor space.
So since I can't find the 43.5 aluminum forklift tanks with the sixth hole, I'm back to needing either:
A replacing the filler valve at the bottom, fitting a dip tube for the vapor valve ending up at the top
B replacing the safety relief fitting with a multivalve including both the pressure relief and vapor service.
B would likely be easier, but that hole may be angled outward not straight along the cylinder axis like the others?