Can non-converted Igloo cooler work as a mash tun?

[PorterIdontknowher]

I've done about a half dozen partial mash batches using a strainer bag in an unmodified 2 gallon cooler. Using the spigot worked, but one thing I discovered was this: If I slid the big plastic stirrer down between the bag and the inside of the spigot, the bag didn't get pulled in with the flow and cause a slow run-off. A slotted spoon would also work...

 

[drkaeppel]

Sounds like it would probably work. I had the exact same issue trying to do partial mashes on the stove. Heat control is damn near impossible.

 

[RobbyBeers]

I used an unconverted 10-gallon cooler and 5-gallon paint strainers for a long time. I didn't even bother with the spigot---I'd usually have a buddy over, and we'd just set the grain bag aside and tip the cooler up into the boil kettle (hot side aeration be damned).