How Does Your Bathroom Sink Drain And Vent Pipes Work

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.

How does your bathroom sink drain and vent pipes work.

Examine the pipes under the sink. The same holds true for plumbing vent pipe. If the drain line runs away from the wall where you want the vent use a reducing y and a 45 degree street elbow to point the vent line toward the wall. Those vent pipes provide fresh air to all the plumbing fixtures so that the system can efficiently move water through the drainage pipes each time a sink is drained or a toilet is flushed.

When plumbing air vents or vent stacks do not work properly neither will your home s plumbing drainage system. The horizontal vent pipe runs right next to the closet bend. It must be at least 1 1 2 inches in diameter. They lead into larger branch drain pipes which lead into the 4 inch stack.

You can find your plumbing. If so note its size. If the toilet drain does not connect directly to a vent you must find another way to vent it. Both kitchen 1 1 2 inches and bathroom 1 1 4 inches are smaller than the rest of the drain system on purpose.

If the drain lines in your home have poor venting as in figure a for example water rushing down the drains will pull water from nearby p traps. A plumbing vent or plumbing vent pipe is designed to regulate the air pressure throughout your plumbing system. A note on the main drain. A typical bathroom sink is a good example of how all these components work together.

It also helps remove gas and odors common with a plumbing system allowing fresh air into the system to help keep the home smelling proper and to help water flow smoothly down the drain and out of the house. Toilet vent option 2. Local building codes that regulate the materials used in the dwv system have changed over the years so most older homes have a combination of materials. As water goes down a drain air is needed to equalize the pressure in the drain line.

Vent stacks in a household plumbing system work the same way. Your home or office s plumbing systems are composed of both drainage and vent systems that work together to remove water and waste. This is the purpose of a venting system. A secondary stack perhaps 2 or 3 inches in diameter serves a branch of the system.

The drainpipes are made of cast iron galvanized pipe copper or plastic.