A single teflon gasket from Teflon sheet also makes a perfect seal. Doesn’t burning Teflon give off a deadly fume? Oliv on the Mamod forum has posted warnings about that…
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As long as your Jensen boiler never runs dry, the gaskets will never burn.
I’m talking about Travis burning the strings of teflon tape off with a torch. I make the same teflon gaskets for my porthole glasses that you do as well.
The warning Oliv gave is that burning it can actually kill a person.