Here's another good article on propane fumigation http://www.members.shaw.ca/k2pilot/Propane%20article.html
This fellow is using an acetylene regulator for a torch on his system.

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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck