Yet another double burner from Punker. This one has another support of the tank compared to the others displayed in here (They all differ in some details). The preheating cups also separates themself from the other Punkers by not having the little lip protruding at the lower front of the stove. It still has the automatic measuring cup in the tank lid for the preheting fuel, but the absence of those little lips makes it a tad bit harder to fill the preheating cups with the alcohol. Otherwise the burners and vaporizers are built in the same way as any Punker. What I try to show with the last pictures is how Punker solved the continously vaporizing of the alcohol. Many self pressured alcohol stoves just let the vaporiser pass right through the flame in order to heat up the liquid fuel. Punker has a primary vaporizer, or preheater device, positioned to the side of the burner. The burner is practically only a sphere of thin brass, surrounded by the actual vaporiser. At the bottom is a larger hole where the jet is spraying the alcohol gas to be mixed with air, and at the top there is the regular ring of holes. Nothing strange there. There is also one single hole in the lower part of the sphere which directs a nice, blue tongue of fire directly towards the primary vaporiser/preheater tube. That's what you hopefully can get an idea of in the last picture. You can also see the different preheating cup in the second last picture.