Okay, I found what I was looking for, but when I wrote 'em and asked if the glass was pyrex, they didn't even bother to write back, so I guess it's not. Not that it absolutely has to be, but that is a nice feature.
http://www.insidesun.com/index.php?a...=3&prevstart=0
vaporhead1 Reviewed by vaporhead1 on . Cool Tubes ? Where in the world do you buy Pyrex "cool tubes" ? I know a hydro dealer in a city near here has one that's like 6-8' long, but I never got around to asking him where he got it. Do a search for this item.....not a lot of results !! Rating: 5