Have you ever heard of a Jet Fluxer?

I just thought I'd run this past you guys, since not too many people have ever heard of this.

Back in the early '70s I got heavily into bicycling, and later I took a class on how to build bicycle frames. You need to avoid burning such thin tubes when brazing them, but at the same time you need good penetration for strength. The class instructor suggested we buy a Jet Fluxer, which is a tank full of special liquid flux that has an affinity for acetylene and is placed in the acetylene line. I still have one, and I like the way it works. You get very good, quick brass flow at a lower temperature. It can also be used for high-temp silver soldering. I can post a picture of the Jet Fluxer if anybody is interested. I don't know if they still make them. That liquid flux is some pretty caustic stuff.