<P> Common wall - thicknesses of copper tubing in the U.S. and Canada are "Type K", "Type L", "Type M", and "Type DWV": </P> <Ul> <Li> Type K has the thickest wall section of the three types of pressure rated tubing and is commonly used for deep underground burial, such as under sidewalks and streets, with a suitable corrosion protection coating or continuous polyethylene sleeve as required by the plumbing code . In the United States it usually has green colored printing . </Li> <Li> Type L has a thinner pipe wall section, and is used in residential and commercial water supply and pressure applications . In the United States it usually has blue colored printing . </Li> <Li> Type M has an even thinner pipe wall section, and is used in residential and commercial low pressure heating applications . In the United States it usually has red colored printing . </Li> <Li> Type DWV has the thinnest wall section, and is generally only suitable for unpressurized applications, such as drain, waste and vent (DWV) lines . In the United States it usually has yellow or light orange colored printing, common sizes being ​ 1 ⁄, ​ 1 ⁄, and 2 inch copper tube size . </Li> </Ul> <Li> Type K has the thickest wall section of the three types of pressure rated tubing and is commonly used for deep underground burial, such as under sidewalks and streets, with a suitable corrosion protection coating or continuous polyethylene sleeve as required by the plumbing code . In the United States it usually has green colored printing . </Li> <Li> Type L has a thinner pipe wall section, and is used in residential and commercial water supply and pressure applications . In the United States it usually has blue colored printing . </Li>

What is the color code for type k copper