Recently had very bad experience utilizing above set-up in that after firing up equipment after long hiatus to solder a silver bezel... Got it going the usual way, running through all usual steps... flame was running smoothly for about two minutes, just starting to heat up bezel in order to flow solder when the torch/hose erupted into a long 2 foot bushy flame at the hose connection to the torch itself as near as I could determine in my panic at the moment, and dropped it to the floor where it continued to flame. Luckily I had the time and presence of mind to quickly shut off the tank valves, after which the flame went out.