There is a good article up on BYO, about chugger pumps
http://byo.com/stories/issue/item/3167-build-a-better-homebrew-pump
I saw that last week. It's a good read. I made the mods to my own pump but haven't tested it yet. I also added a dial thermometer while I was at it. Looks the berries :P
(https://lh6.googleusercontent.com/-azLtNdFR8aA/VFzIAzQThkI/AAAAAAAAGmY/uoq9NqxyLU8/w430-h760-no/IMAG1375.jpg)
I love the 3/4 centre feed with the 1/4 quick disconnect. Snigger.
Now I just want a pump :/ Of course, I mentioned the idea of a cooler mash tun tonight at room and the eyes started rolling. I think I'll need a bigger boat soon ;)