The U.A. comprises steamfitters, pipefitters, pipeliners, service techs, and other pipe trades, so working as a traveler for another U.A. local you would be working under the same book paying dues to your local, (the $35 a month or whatever they are charging out of 798), and the 3% per pay period to the local you are working as a traveler for. You also end up paying into the annuity for certain local's i.e. sprinkler fitters, and that can sort of suck because they never seem to get things right and you end up losing your money! The boilermakers are pretty good to work permit for because once you finish up your job for them and don't go back to work for them as a permit hand for x amount of years they will cut you a check for the money you have invested in their retirement fund. If you end up working for the boilermakers, iron workers, or carpenters, (whooo hoo steel studs!), then you would be working as a permit hand and still you would pay your dues to your local and whatever the percentage the local your working for as a permit hand takes. There is more to the pipe trades than just the pipeline, so if your experience was comprised mostly around working in paper mills, power houses, chem plants or other typical maintenance projects it may be a better fit to join one of the other locals. That being said a traditional fitter's local you don't supply your own tools other than what is in the contract which is usually something like a 25' tape measure and a torpedo level, so rolling up with your rig truck would be semi awkward, haha. The unions aren't a bad way to earn a living and a lot of the guys you work around are alright, however; as with any other facet of construction there can be a lot of down time and jackasses. The only difference for the jobs on the union side of the house is you are receiving your referrals through the union hall, so when you get the red ass and want to drag up you could end up putting your self on the other end of a slow moving bench.