10 Gallon Seat Top Cooler by Igloo.  UltraTherm Insulation, Impact Resistant, Reinforced Handles, Stackable.  Flat Lid is pressure fit (not threaded).  Since the lid isn’t threaded, you can fit a temperature probe underneath [See: Hands On: ChefAlarm Thermometer].

I use this same cooler for my mash tun and it has worked great for me for years.  It holds temperature very well and it has held up like a champ.  It would also make a good HLT.

If you want to convert this to a mash tun…. consider this conversion kit from Brew Hardware.  Check my Review

Igloo 10 Gallon Seat Top Beverage dispenser with spigot and Cup Dispenser

Also: All Grain Tips & Gear

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