Can two bathroom sinks share a 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.

Can 2 sinks share the same trap?





Two sinks can share a trap as long as the centerline of the outlet (tailpiece) of both sinks is not more than 30-inches horizontally from the trap centerline, per International Plumbing Code (IRC P3201.

How do I run plumbing for two sinks?

Quote from the video:
Quote from Youtube video: And run a water line to the t. Okay so what we're gonna have to do here is connect the water coming in with the sink on the right. And sink up on the left.

Does a double sink need two water lines?

Good news, your double sink doesn’t need two P-straps. In fact, most plumbers will avoid this type of installation and use a T-configuration to lead both drains to one P-trap. There may be instances where your pipe coming in from the wall is too tall to work for one P-trap.

How many sinks can you have on two drains?

710.1 Maximum Fixture Unit Load

DIAMETER OF PIPE (inches) MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu)
Total for horizontal branch Total for stack greater than three branch intervals
11/2 3 8
2 6 24
21/2 12 42

Can I add another sink in bathroom?





It’s entirely possible to replace a single sink with a double sink, although it requires a bit of work and money. Double bathroom vanities, sometimes called “his and her” sinks, can be more practical in situations where two people go through their morning routines simultaneously.

Why are there two drains under my sink?

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.

Can two drains share a vent?

Common vent



This very simple concept allows two traps to be vented by the same vent. The two traps and their fixture drains can be either at the same level or at different levels, provided that they are on the same floor. The following diagrams show some of the various approaches to common venting.

Can a bath and sink share the same drain?

Yes, the drain for the shower and the sink can be the same. The shower and sink can use the same drain pipe if it is well below the sink and shower level.

Does a double sink require two P traps?



Related Articles. A double bathroom sink installation rarely requires more than one P-trap. The usual practice is to connect the two sinks to a tee and then feed the tee into a single P-trap, which then connects to the drain. The pipes you use to connect the sink to the P-trap are the same type the P-trap is made from.

Can you make a double sink into a single?

It shouldn’t be a big deal, but you would have to first remove the old vanity and then open up the wall and do some re-plumbing. You would cap off one drain and one set of hot and cold pipes in the wall.