FYI, the MAPP gas and "Bernzomatic" screw on propane torch head are not 100% compatible. Seems the MAPP gas will erode the propane torch rubber and you'll get a nasty leak out the knob area. I had one that flamed up on my and I had to throw it into the corner of the yard thinking it was going to explode! It just sat there sputtering for about 10 minutes, melted the knob and finally gassed out.
