Among the pipes, they are like a connector that is used to change the size, change the direction, and as a connection of the equipment with the pipes, and these connections have different types, including bushing connections, hub connections, cold connections, and tee connections. and other, and each has a specific use. And the connection material may be rubber, copper, steel and plastic. PVC fittings used specifically for sewers are sometimes called DWV (drain, waste and vent) fittings. PVC fittings are often white or gray, but green, blue, and yellow are also seen. There is no specific meaning to these colors, although white and gray are often seen in plumbing applications, and green is often used for sewage.
Its advantages are: light weight for transportation, flameproof, electrical insulation, resistant to shocks caused by earthquakes and other external pressures, resistant to corrosiveness and solvents, etc.