[ihc] High pressure tanks

["Jim Grammer" <jgrammer@xxxxxxxxxx>]

I hadn't thought about the drain valve, though. Yes, it is a good idea to
drain air tanks. On a conventional tank, the idea is to prevent rust and
possible rupture (as well as making it easier for the line filters). Perhaps
that's not as big an issue on an SCBA tank? Don't know how they're
constructed... Dennis? Or anyone else?

Forged cro-mo steel.

Jim