wrote:
I was curious why there are iron pipe fitiings and compression
fittings? Seems like plumbing would be easier with one type{compression
or pipe} of fitting. So in what situation would you use compression
over iron pipe and vice versa? Are compression fittings designed to
take more water presssure? Thanks.

Aren't iron pipe fittings often compression? What is a pipe screw/thread
fitting if it isn't compression?