Just your basic small-size zip-ties. I'm not too concerned about them loosening up, I've used them for years in lots of different applications, and never had a problem with them. Very reliable little dudes.
I don't have any pics, but it's a 56-qt Rubbermaid (I think -- too lazy to walk down and look) rectangular cooler. Went to Fastenal and got a 3/8"x2.5" brass nipple (heehee), 3/8" ball valve, and a couple barb fittings for the end of the nipple and the ball valve. Plus some 5/8" washers for spacers and some O-rings to seal everything.
Got the braid from a hose purchased at WalMart. My Dremel died on me and I couldn't find my metal snips, but my band saw lopped the ends off in about half a second. Pushed the braid off by hand in about 5 seconds, then assembled and leak checked. Works beautifully.
Can't wait till next week. I'll break it in with my take on Three Floyds Dreadnaught IIPA, which was always too big for my 5 gallon Igloo cooler.