> concerned about the use of steel tubing vs brass

Steel is much stronger than brass, especially after the tank has been silver-
soldered (or welded, in Bob's suggestion).  Brass is used because the 
makers use it a lot for other things like platework, and because it solders 
nicely.  Steel is preferable, but not so much so that it's worth going after if you 
are already set up to work with brass on a large scale, as someone like 
Roundhouse or Argyle are.


-vance- 

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