To understand what a slipped, or herniated, disc is, you have to understand how the intervertebral discs work in your spine. Intervertebral discs are natural shock absorbers between the stacked vertebrae. These discs have two main components, an outer fibro-elastic shell and an inner, gelatinous core.
Drain-waste-vent (DWV) pipes carry waste and water out of the house without gurgles or fumes. Never install or replace a DWV pipe without consulting a building inspector. These pipes must be installed according to precise specifications. Drainpipes. The centerpiece of a DWV system is the main stack, usually a pipe 3 or 4 inches in diameter that runs straight up through the roof. A secondary stack, perhaps 2 or 3 inches in diameter, serves a branch of the system.
Not all pipes are as useful or effective as others, and each type is used for a specific purpose in plumbing. PVC pipe is a type of plastic plumbing pipe primarily used to transport high pressured water.