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"Tun Cosy" pot/kettle insulator for mashing

Hi folks, Thought I'd share my removable "Tun Cosy" for keeping mash temp steady in a stainless steel pot. It's made of expanding foam and it's dead cheap to make. Used it for a few brews now and my mashes drop less than 1 deg C every time. Beats wrapping towels around the mash! Here's an instructab...

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