"carl mciver" wrote in message
k.net...
snip----

The low heat of brazing will not affect the heat treatment of the
tank wall that much.

Not true, Carl. Anything above 700 F will change any heat treat present in
carbon steel for the worse, but I'm not convinced tanks are heat treated, so
it's a non-issue. Brazing, even silver brazing, occurs at a temperature
over 1,000 F.

Harold
coupling to the flange before brazing and connect that to the drain valve.

Does this sound safe?