Here are a few photos of my BobbyM-direct-fire-Mash-Tun-Insulation-CLONE...Thanks Bobby!
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I sealed up the top of the insulation with silicone sealant, which you can see in the next photo. After the sealant had dried, filled 'er up with 12 gallons of water and heated to 170 deg F. Then I had to go to dinner with SWMBO, and when we returned three-and-half hours later it had only lost 15 degrees! Not Bad?!
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Dude. Respect. It's the best clone I've seen and I'm always amazed that I was able to pull it off with my meager metalworking tools and skill set.