On Tue, 31 Jan 2017 10:51:52 -0600, CRNG
wrote:


No difference except for the color and fittings.

Not exactly true. Water pipe is certified not to leach unacceptable
levels of chemicals into the water. I still see a lot of Rigid
Nonmetallic Conduit used as water pipe where UV protection is
important but that is generally for irrigation or a fish cleaning
station on a dock where the chemicals are less of an issue.