On Sun, 27 May 2012 07:27:39 -0400, George
wrote:




http://www.copper.org/publications/p...e_handbook.pdf
Underground Water Services—
Use Type M hard for straight lengths


That is the type M, right?

IIRC, "L" is heavier than "M".


Often type K is required for the outside buried run.

Possible, check your local codes.

Types K, L, M, DWV and
Medical Gas tube are designated by
ASTM standard sizes, with the actual
outside diameter always 1/8-inch larger
than the standard size designation. Each
type represents a series of sizes with
different wall thicknesses. Type K tube
has thicker walls than Type L tube, and
Type L walls are thicker than Type M,
for any given diameter. All inside
diameters depend on tube size and wall
thickness.