I only brew 2-2.5 gallons and ferment in Mr. Beer's LBK's. Made my first all grain BIAB in an electric turkey fryer, [Irish Red], and decided to build a kettle. A 24qt Bayou Classic, 1440W Rheams 120v SS element, and ball valve kit from Bargain Fittings. The 1" knockout punch from Harbor Freight worked like a dream. The hole is a little large, and the silicone o-rings do not seal properly. The washer that came with the element works fine. I also sealed all holes with red high temp silicone from Lowes. [grill dept.] Next project will be a temp controller.
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