Definitely DO NOT use the galvanized stuff. While not much zinc will leach out into your beer each batch, you do not want the stuff building up in your system as you drink the beer. If you can't find/afford stainless fittings, go with brass fittings. Those are much easier to find and cheaper besides. You will want to "pickle" them first. John Palmer explains the process in How to Brew.
Cleaning Brass
Some brewers use brass fittings in conjunction with their wort chillers or other brewing equipment and are concerned about the lead that is present in brass alloys. A solution of two parts white vinegar to one part hydrogen peroxide (common 3% solution) will remove tarnish and surface lead from brass parts when they are soaked for 5 minutes or less at room temperature. The brass will turn a buttery yellow color as it is cleaned. If the solution starts to turn green and the brass darkens, then the parts have been soaking too long and the copper in the brass is beginning to dissolve, exposing more lead. The solution has become contaminated and the part should be re-cleaned in a fresh solution.
Wayne
