Cameron Double Seal 'O-Ring' System

All current generation Cameron burners have a double ‘O’ ring seal in the blast valve stem plus an intra-seal vent that automatically redirects any propane leaks back into the burner can, rather than out of the valve stem and onto the pilot and passengers.  This is an extremely important operating feature.  If an ‘O’ ring leaks in other brands of burner, the pilot would be forced to shut the burner off or execute an immediate emergency landing. (Cameron introduced the double 'O-Ring' well before the Challenger shuttle  disaster.  Space shuttle rockets now incorporate the same double 'O-ring' and vent system as in all Cameron Burners).

With a Cameron burner, if the first ‘O’ ring fails, the vented chamber between the ‘O’ rings channels the fuel to the pilot light where it harmlessly combusts.  As a result, pressure build-up behind the second ‘O’ ring is eliminated, allowing the pilot to continue flying on to find a suitable landing site-- all without having to turn the burner off.