Recently, as I was cleaning my cooler mash tun, I dropped it on one of the corners and cracked it. So I took a cooler that we already had and put together a new mash tun. For this new mash tun, I used a 12 inch Watts stainless 3/8 inch faucet connector from Lowes (part # 76301).
The new mash tun is a Coleman 40qt (Blue!) cooler and although it's not a coleman extreme, like the extremes, it has a nice channel that leads to the drain. My last tun had a long braid connected to a T-joint bulk head. Since I realized that the all the draining happens near the drain, I went with a smaller braid and crimped the end (similar to Denny). I mostly do 3 gallon batches, so the most amount of grains I will put in there will be between 9- 10lbs (recently did an imperial stout w/ 9.5lbs).
I know it's not a large sample size, however, with 4 brews through this mash tun, the braid has worked great and has held its shape.