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Message: <blockquote data-quote="Tazza" data-source="post: 14463" data-attributes="member: 82">I have seen that setup, one set of plans was essentially the same. You get a large LPG tank and cut the top off, invert and weld it it in place. It had the same seal setup as you said but his also had a bolt and nut to hold the cap in place. The static pressure would be more than enough to hold it there though as you said. Filling it with sand isn't THAT much effort but the inverted lid would speed things up a lot.I was in a bit of a hurry to build it as i was a little skeptical that it would actually work and didn't want to spend too much time on it.</blockquote>