[frnkeore]

Dale,
The main thing about selecting things, is that you use common sense. For instance, if Teflon tape will seal a joint, air tight, then it will seal a water joint, especially if it's under high heat and pressure. I don't like using it but, I have to, if I want my air systems to not leak.

Second, I haven't looked for it yet but, if it's a Teflon past, it's probably used for sealing pipe fitting, maybe even designed for that purpose and if so, can be purchased at a plumbing supply house for $3 or less.