Why does my bathroom sink have two drains?

In two drain line systems, one of the drain lines disposes of garbage water. The other one is installed as a vent. By the plumbing rules, the left drain is used as a vent. Comparing it with a single drain line system this vent is not needed anymore.

What is the second drain in a sink called?

If you have, chances are you have noticed a small hole under the faucet often located towards the back of the bowl. This little hole, known as an overflow hole, is one thing a lot of people never think about.

What is a stub in plumbing?

A stub-out is the exposed portion of a pipe installed during a plumbing, electrical or gas rough-in that is ready for connection to a fixture or device.

What does stub-out mean in plumbing?

‘Stub-out’ means that the major components of the plumbing/electrical parts are installed inside the wall and through the ReBar (they will be finished at a later date).

Does a double vanity need two drains?

A double sink vanity has two sinks. Each sink will need its own drain. But two sinks don’t need their own p-traps. It is common practice for them to share one trap.

Can two sinks share one drain?

In most cases, you can easily adapt the supply and drain pipes to accommodate two sinks, using tee fittings, special valves, extension pipes and hoses. You may have to vent each sink separately, though, depending on your local plumbing codes.

What are the parts of a bathroom sink drain?

Here are the parts of a sink drain you need to know about:

  • Strainer basket: This part fits into the opening at the bottom of your sink basin. …
  • Strainer flange: This piece sits directly below your strainer basket. …
  • P-trap: Made up of two pipes, this assembly removes waste and water from your sink.

What is the pipe under the bathroom sink called?

The U-shaped bend in your drain pipe is called the p-trap. This pipe is also referred to as a trap. However, the term trap can refer to a number of plumbing fixtures that serve similar purposes.

What is overflow on sink drain?

What is an overflow drain? An overflow is an opening that helps prevent flooding by rerouting excess water back to the drain pipe once it reaches a certain level.

What is the purpose of a stub out?

Stub out elbows are primarily used when installing PEX pipe to stub out of the wall and allow for further connection of outlet stop valves and plumbing fixtures. Stub out elbows with ears can be nailed to a wooden surface, such as a stud.

How high should sink stub outs be?

Registered. 20″ – 21″ for lav drain, 23″ – 24″ for lav water stub outs. Kitchen around 15″ for drain and 1 hot stub @ around 12″ and another @ 20″, same with cold.

How long should a sink stub out be?

Wall Drains



Like the supply stub-outs, the drain stub-out extends from a fitting — usually a sanitary tee — to a point 3 or 4 inches beyond the wall.

When installing a drain line how many inches should the drain line be installed off the floor?

Discharge hole (vertical): About 16 to 20 inches above the floor; consider drain pipe to be the vertical centerline. Fixture (side to side buffer): From centerline, 15 inches minimum, 20 inches recommended. Fixture (front buffer): Minimum distance to nearest obstruction is 21 inches; 30 inches recommended.

How high should a vanity drain be?

The water supply line runs out of the wall into a hole in the back of the vanity, typically placed at a height of 22 to 24 inches from the finish floor. The sink drain is then situated just 4 inches inward from the water supply line.

How do you remove drain stubs?

Cut the PVC pipe at any point inside the wall that allows you to remove the stub-out, using a hacksaw. You may have to make two cuts to separate the tee holding the stub-out from the waste and vent pipes. Remove any clamps holding the stub-out with a screwdriver or hammer, and pull out the stub-out.

What is pipe joint compound used for?

Pipe joint compound can be used for pipes that carry air, gas, oil, and, most relevant to plumbing, water. After application, it dries like glue to create a strong seal. It also serves as a lubricant for threaded pipe joints.

How do you install drain stubs?

Quote from the video:
Quote from Youtube video: Starting with a drain tee in the wall. Fit the PVC segment into place creating the stub out finish the stub out by adding the Marvel connector to the end.

How do you use a PVC trap adapter?

Quote from the video:
Quote from Youtube video: Apply it to the trap adapter. And to the drain. Line. Now you push as far as possible. And hold it for 10-15 seconds. Now you can release it and this is how you install trap adapter for the climax.

What is a trap adapter plumbing?

Trap To Drain Flexible Adapters



These trap to drain adapters are so flexible they can be used for bathroom sinks, kitchen sinks, laundry trays, bar sinks, bathtubs or utility sinks to quickly connect to drain pipes. And you won’t have to wait for any glue to dry.

What is a sink trap adapter?

White Plastic Threaded Sink Drain Pipe Adapter with Slip-Joint Nut and Washer. Use this 1-1/2 in. PVC Threaded Trap Adapter to connect your sink drainage to the drain pipe that extends through the wall or floor. Designed to fit most tubular drain applications, this universal adapter is constructed from PVC plastic.