"Because PVC piping system components can be manufactured in a variety
of colors, identification of application is easy. A common color
scheme (although not universal) is:


White for DWV

White, blue, and dark gray for cold water piping

Green for sewer service

Dark gray for industrial pressure applications

This color scheme has an exception in that much of the white PVC pipe
is dual rated for DWV and pressure applications."



On Thu, 28 Oct 2004 10:18:03 -0500, John Hines
wrote:

(Al Kondo) wrote:

I am in the process of changing out the clay pipe in my backyard. It
has several locations where it has cracked and roots have grown into
it. As you can imagine, it has given us problems over the years. I
am going to replace the clay pipe with schedule 40 PVC pipe.

You should DWV PVC, which is green, and connects together with rubber
o-ring couplings, and not glue. This allows for expansion,
contractions, and flexing of the pipe.