Rapid technological advances in plastic plumbing may leave local plumbing codes outdated. So, before purchasing your materials, it's a good idea to consult your city or county building officials. Sewer pipes are made to carry household wastes below ground to a public sewer or private disposal system. Drainage pipes are used below ground, too, but are thinner-walled and lower in cost. They're usually used with non-septic water, such as roof runoff.
Tubular goods are the thin-walled fixture drain and trap parts used beneath sinks and washbasins.
Because plastic pipe is non-conducting, it cannot be used for electrical grounding. PVC pressure pipe should be used only for cold water outdoors. It is ideal for building lawn-watering and irrigation systems. PE pipe serves a similar purpose but is flexible and cannot be solvent welded. PE is especially useful as deep-well pipe.