On this application Tim I just used a roll of Hillmans 19ga dark annealed Steel wire. I don't think you need anything as heavy as 16ga (1/16“) to hold the bundle together. A little wax worked into the wires should keep it from rusting since the only time I’m gonna see any rain is if I got caught in a burst by accident.
If I were going to use this as my daily driver them I'd paint all the bare fasteners or use SS or plated fasteners. If I were using the wire ties I'd probably use a 304 SS annealed safety wire, which is available from any aircraft supply such as Aircraft Spruce and Specialty or less fancy galvanized wire from any hardware or farm supply.
Remember now I've said I was a hoarder in the past so I've collected a pretty good selection of SS safety wire left over from when I was messing with the airplanes. I've picked up spools of general purpose steel wires when ever I see a size or finish that I didn't have on the shelf. Farm supplies have a lot of wires for bailing, fence repair and just general purpose.
http://www.pbase.com/dennygraham/image/137189786/large I wouldn't over do it, it doesn't take a whole lot to hold a few tubes together and the leverage you could get with the larger Clamptite tools is enough to bend the tubing.
Here are a few pictures of a wrap made with 16ga (1/16“) galvanized steel wire. This really pushes the limit of the small tool and you have to work at it to get it to look neat:
http://www.pbase.com/dennygraham/5591547_fuelvacuum_pump&page=2Denny Graham
Sandwich, IL
