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Connecting Two Toilets to One Soil Pipe: The Ultimate Guide

If you live in a small, cramped home or apartment, connecting two toilets to a single soil pipe might be a clever solution. You can save time, space, and money on plumbing bills by connecting two toilets to a single soil pipe.

But how to connect two toilets to one soil pipe? To connect two toilets to a single soil pipe, you must first attach a tee fitting to an existing soil pipe and connect the waste pipes from each toilet to the tee fitting.

Check out the article below for a step-by-step guide on how to connect two toilets to one soil pipe.

connect two toilets to one soil pipe

Connecting Two Toilets to One Soil Pipe: A Step-by-step Instructions-

You can connect two toilets using one soil pipe if they are on the same side of your house. It will allow the waste from both toilets to flow into the same soil pipe. Thus, it will be carried out of the building to the main sewer line or septic system.

You should make sure the pipes are installed in the right order and at the right size to prevent blockage.

The following instructions will give you a proper idea of how to connect two toilets to a single soil pipe:

The tools you will need for this process

  • PVC soil pipe
  • Screwdriver
  • Saw or pipe cutter
  • Sandpaper
  • Access plug
  • T-shaped pipe fitting
  • Rubber joints
  • Measuring tape
  • Wrench
  • PVC cement

Step-by-step Instructions-

Step 1: First, turn off the water supply of the existing toilet. After that, unbolt the soil pipe from the flange, remove it, and then drain the pipes.

Step 2: You need to plan ahead of time the location of the second toilet. Then use a marker to mark the location of the new flange. The flange should be approximately 4 inches.

Step 3: Measure the length of the soil pipe that needs to be removed. Then, use a pipe cutter to remove a portion of the soil pipe to make a place for the  T-shaped pipe fitting.

You should make sure to keep the soil pipe slightly longer than the tee fitting to connect the tee fitting and the soil pipe securely.

Step 4: Once the pipes have been cut, you must use sandpaper to smooth down any uneven or rough edges.

Step 5: Now, the T-shaped pipe fitting must be installed onto the soil pipe by joining the cut ends of the soil pipe to its branches. To keep the connection secure, use a pipe wrench to tighten the nuts on the couplings.

Step 6: Attach a section of the waste pipe onto each branch of the tee fitting.

Step 7: Install the new flange for the second toilet. You need to make sure the new flange for the second toilet is parallel to the ground and firmly fastened to the floor.

Step 8: At this point, use a rubber joint to connect the waste pipe from the second toilet to the new flange.

Step 9: The waste pipe from the current toilet should then be connected to the tee fitting using a rubber coupling.

Step 10: All of the connections, including the rubber joints and the tee fitting, should be glued together with PVC cement.

Step 11: The next step is to turn on the water supply to the toilets, flush both of them to check for leaks, and look for any water leaks at the connections.

Step 12: When you are certain there are no leaks, use the bolts and nuts to secure the toilets to the flanges.

If you have any questions concerning the procedure, I suggest watching this YouTube video for a visual representation.

Connecting Two Toilets Benefits & Challenges-

It is important to note that connecting two toilets to one soil pipe requires careful planning, execution, and good plumbing knowledge.

Before you take on the complex endeavor, you should therefore be aware of the benefits and drawbacks of this approach.

Benefits

The following are some benefits of joining two toilets to a single soil pipe:

  • Lower cost of installation– It may be more expensive to install two separate soil pipes for two toilets than to link them to a single soil pipe.
  • Saves space- You can save space by connecting two toilets to a single soil pipe, especially in smaller houses or apartments.
  • Increased efficiency- Connecting two toilets to one soil pipe will increase the effectiveness of the plumbing system as it reduces the overall length of the waste pipe network.
  • Greater convenience- You won’t have to wait for a single restroom to open up if you connect two toilets to one soil pipe, making it more convenient.
  • Environmental advantages- It is more environmentally beneficial to use one soil pipe for two toilets as it helps to save water.

Drawbacks

While connecting two toilets to a single soil pipe can have many benefits, there are a few potential drawbacks to take into account, including

  • Complicated installation process– You will require technical plumbing skills, as well as specialized materials and tools for proper installation.
  • Limited use of water– When two toilets are connected to a single soil pipe, it is necessary to use limited amounts of water in the toilets to avoid overloading the plumbing system.
  • Gets damaged easily– The plumbing system may experience greater strain if two toilets are connected to a single soil pipe, which could eventually result in increased wear and tear.
  • Chances of blockage– Connecting two toilets to a single soil pipe can increase the risk of blockages if the pipe becomes overloaded with waste.

Overall, while connecting two toilets to one soil pipe can have several benefits, this type of installation should be performed with the assistance of a plumber.

FAQs

Here are some frequently asked questions related to connecting two toilets to one soil pipe.

Q: What kind of tee fitting should be used for connecting two toilets to a single soil pipe?

A particular kind of tee fitting called a double sanitary tee fitting should be used to connect two toilets to a single soil pipe. It was created specifically to join two waste pipes to one main drainage line.

Q: How can I avoid blockages when using a single soil pipe to connect two toilets?

Using the proper waste pipe size and avoiding flushing items like sanitary items, wet wipes, or dish towels down the toilet will help you avoid blockages.

Q: To connect two toilets to a single soil pipe, what size waste pipe should be used?

The waste pipe should generally be big enough to accommodate the maximum flow rate of the toilets. To connect two toilets to one soil pipe, you will need approximately a 3-inch waste pipe.

Final Words

Overall, connecting two toilets to a single soil pipe can be a practical and efficient plumbing solution when done correctly. You can reduce the expense of plumbing installation and maintenance by connecting two toilets to one soil pipe.

However, it’s important to make sure that you use good-quality plumbing materials and that plumbing is done properly to prevent blockages and other plumbing issues. Hence, it is recommended to speak with a qualified plumber before connecting two toilets to a single soil pipe.