Hi Team. I picked up this behemoth for the princely sum of NZ$35 at our antique auction a few weeks back, when I looked it over it seemed to be complete apart from the usual rock hard pressure seal on the filler cap. The hammer on the ground is for size scale, not for 'adjusting'. The label calls it a Coleman 457G Handy Gas Plant. Biggest petrol stove I ever did see! A bit cautious of anything that holds that much petrol, I spent some time just pressurizing the tank with compressed air and fiddling with the valves etc. It seemed to hiss from all the right places and the paint applied by the last owner didnt seemed to have found it's way into anything vital, so last nite I poured in a couple of liters of 91 octane, pressurized the tank, held a gas torch to the burner and opened the valves..... Like any Coleman, it hissed at me, spluttered a couple of times then lit up neat as you like 8) It was then I discovered the black paint used on the burner most surely WASNT hi-temp stuff, it flared and carried on nicely for a minute or 2 then settled down to an impressive blue foundation with an orangy pyramid of flame about 6-8 " tall. Before anyone states the obvious, I'll try to get a pic of it running tonite, if my old and knackered digicam obliges I put a 10" X 12" hot plate on it to see what the flame pattern did, flames poured over all sides of the plate It fair chucks out the heat, much as I thought it would, and I'm planning to use it to heat my outdoor bath in summer when an open fire is neither safe nor smart. The pressure gauge goes up to 80psi, so far I have yet to run it past 30 or so, that being as much as my big compressor will comfortable cope with. The gauge has no red line for over pressure, but I would hesitate to go much past 50-60 psi anyhow, call me chicken... I ran it for about 15 minutes at 20-odd psi, pressure seemed to fall off slowly and a top up of air back to 35 psi geed it up nicely. Question: Do these self pressurise, or do I need to re pressurise it every so often? I would have thought it was self pressurising once running, but my experience with these things is limited to 1. It looks like the burner support pole has been replaced at some point, the only pic I could find of the same stove clearly shows the burner sitting almost on top of the tank. The only thing that does concern me just a tad is the O ring I used to replace the hard one is quite a lot thicker than standard. It seals ok, but seems to foul the vent on the cap, when I had it pumped up with just air, I tried to relieve the tank pressure (only 15 psi) by carefully unscrewing the cap, which promptly blew right off with a resounding boom and tossed the cap and valve stem/seat out of my hand and across the workshop. Lesson learned. Either way it's an interesting thing, I await with interest to see how it goes heating a cast iron bath. I'm picking it'll cope fine.