I prefer steel fittings and almost never use any die cast. Most projects that have written specifications for things like fittings will require steel fittings. Public works projects often require steel compression fittings. In my area they don't seem to be requiring the compression type now. Steel does cost a little more but you need to work with you supplier on pricing.
Re: STEEL OR DIECAST#27853 08/04/0309:56 AM08/04/0309:56 AM
I like the "feel" of steel. I like the cost of "cast."
One place where the die-cast shine: when you need to remove that inside lip from a coupling, so you can slide it over the pipe. Sometimes, the plumber cuts through conduit whith his concrete saw. Of course, you need to pull new wire- but how do you repair the pipe? Slide couplings over either end, insert a replacement section of pipe, slide coulpings into place, and tighten. Try removing the lip from a steel coupling, and you'll understand why zinc is preferred.