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.
The geyser sits in a tray made of plastic (often red) or tin plate. I prefer the plastic ones. They don't leak. Since June 2001, the drip tray is not optional-its got to be there and there has to be a drain pipe for it! The drain is a 50mm PVC waste pipe that drains the tray by piping the water out the house. shut off valve (tap) on the cold water side. The cold water side is the side that directly connects to the drain cock and enters the geyser at the bottom. After the shut off valve you would normally find a Pressure Control Valve (PCV). There are a number of different types.