Can a toilet and a sink share the same drain?

Yes, the sink can tie into the same drain. Be sure to use a trap! Personally, I would make the sink connection to the drain as close as possible to the vertical.

Are toilet and sink plumbing connected?





Plumbing contractors can connect drain lines in the floor beneath the bathroom and install a vent that will allow water and waste to drain without forming an airlock. The sink drain will empty into the toilet drain line because the toilet has the largest drainpipe.

Can sink and toilet Share vent?

Wet venting is most common in conjunction with toilets and sinks; the drain for the sink is also the vent for the toilet. It can also be used for a variety of other applications but due to the following rules this is the most convenient and common situation to run into.

Are toilet and bath drains connected?

When your plumbing systems are working well, you can drain your bathtub and shower water down your pipes. Your bathtub and toilet drain down separate pipes until they reach the main sewer line which is the primary pipe to which all drain in your house lead.

How do you vent a toilet and sink together?

The most common configuration is to feed 2″ PVC down from the ceiling within the wall behind the toilet. The vent pipe connects into the toilet drain pipe. The sink drain pipe and the tub/shower drain pipe are vented with 1.5″ pipe that branches off from the 2″ PVC mainline.

Can you put a toilet where a sink was?





You can potentially rearrange fixtures and still make use of the existing plumbing. For instance, you can have your toilet and your sink swap places. However, there’s more to this job than meets the eye. You have cold water running to the existing toilet area, which fills the tank in the back.

Do showers and toilets use the same drain?

The general answer is that the showers and toilets can use the same drain, but they should not be sharing the same waste trap arm. There are other factors to consider as well, such as whether your drains lead to the main sewer line, or if there are septic tanks that are used in your city or town.

Are sinks connected to sewer?

A kitchen sink drains to the sewer line just like your toilet, washing machine and shower/tub. Although each of these fixtures has a separate drainpipe, the drainpipes are all connected to the main drain stack which is connected to the sewer line.

Can a toilet and sink share the same drain UK?

Can a toilet and sink share the same drain? Yes, but the sink must empty into the toilet drain. Toilets have the largest drainpipe, so plumbers empty the bathroom sink drain, which is smaller in diameter, into the toilet drain line.

Are all drains in a house connected?



Your sinks, toilets, showers, and washing machine each have their own branch line drains. These branch lines connect to your main house drain at some point. If your main house drain becomes clogged, all of the other drains in the house can back up.

Can a shower and sink share a drain?

1:Can multiple bathroom sinks, baths, showers ect share a common drain pipe ? Yes they can and do all the time.

Can you connect sink waste to bath waste?

No problem joining a basin waste to a bath waste, be sure to put an anti vac device somewhere on the basin run if the waste trap itself doesn’t incorporate one……

Can you hook up 2 sinks to 1 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 two sinks share one P trap?

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. Of course, you can have two if, for some reason, that works best for your application, but you’ll just be spending money you don’t necessarily need to spend.

How many sinks can share a drain?

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 many fixtures can you have on one drain?

710.1 Maximum Fixture Unit Load

DIAMETER OF PIPE (inches) MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu)
11/2 3 8
2 6 24
21/2 12 42
3 20 72

How many toilets can be on a 3 inch drain?



As a horizontal branch 3″ is good for 20 DFU’s or 4 bathroom groups.

How many fixtures can you vent on a 2 pipe?

A horizontal wet vent could have as few as two fixtures or as many as ten fixtures but not more than two fixtures of any type can be connected to the system. Each wet vented fixture drain shall connect independently to the horizontal wet vent.