Dewar percolator help?

FIFA bong

Member
Hey, I've been lurking pretty hardcore. I have a question though. How does the Dewar fix the back draw problem? I understand it's jacketed, but I feel like that won't prevent the water from pushing back.. Anyway, that'd be great if someone could MS Paint a diagram, I'd greatly appreciate it!

Loving this site, I hope the threads I've been lurking on are a great indication of the RIU community.
 
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