"DaveC" wrote in message
news.net...
I've got an old 20 gal (?) compressor tank in which I want to install a
drain. I'm guessing it to be 1/4-inch (6.3 mm?) thick steel. Tank is rated
to
125 psi.

Can I drill and tap this for 1/4 or 3/8-inch pipe? Or should i get a
"plug"
welded to it that I can drill & tap?

Are there rules to follow for such stuff? Is there a better n.g. to ask
this
question in?

Thanks,

don't all compressors already have a drain, unless this is a homebrew job?