Old Steel Tank From The Late 70s

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For doubles, I have a set of Catalina AL 45's and a set of flame sprayed 38's from the way back machine. I'm amazed guys tote those doubled up 95's around and when a set of those hit the deck after a good roll, wow. Watch your feet.
 
I'm curious what about them makes for poor backmount doubles? Is it that they are too narrow to properly fit a manifold / bands? I haven't doubled up any tanks (yet...), so I'm a novice when it comes to such things.

You can find bands for them (for 7" tanks) and the standard threaded manifolds work fine. I just don't like the way they trim out for me. I find AL80 doubles much better, which is weird because I don't like them as single tanks, and I love 72s as singles. Go figure.

The real beauty of 72s is that they weigh only 27lbs and are roughly neutral when empty. For shore dives where you don't need too much air they're perfect. Compare that with an AL80 that holds not much more air, weighs 34 lbs and is 4 lbs positive, so it's like an extra 11lbs to lug around shore.
 
Just a quick thank you to the folks on this thread! The tank passed hydro with flying colors - got me a new old steel 72. :D
 

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