Toilet Drain Pipe: Definition, Location, Functions, and Fixing Tips

What is a toilet drain pipe?

The toilet drain pipe is a unique piece of PVC pipe that mainly carries all the waste and liquid throughout this viaduct and lets them emancipate into the main septic tank system. The drain pipe is always made of a durable polyvinyl material that is scratch-resistant, water-resistant, and much more durable in terms of workability.toilet drain pipe

Where is the toilet drain pipe located?

The toilet has so many different aspects that it becomes complicated to maintain all those parts. Unlike all the toilet parts, the drain pipe is also crucial because all the waste is carried away through the drain pipe. The drain pipe is 12 inches from the wall behind the toilet. This calculation excludes the measurement of the drop wall. The drop wall is around 1 to 2 inches wide, so if we include this calculation, the total distance will be at least 15-1/2 inches from the center of the flange to the wall framing, which is very significant to include the drop wall calculation.  where is the toilet vent pipe located

What is the standard size of a toilet drain pipe?

The size of a toilet drain pipe varies in different types of environments. If you want the pipe for your home, purchase a 3 inches diameter pipe. Suppose you want to inject the drain pipe in an industrial or commercial aspect. In that case, you must implement a drain pipe more than 3 inches in diameter because the waste’s load and pressure are usually very high in public toilets. 

How to connect the toilet drain pipe?

The process of connecting or installing a drainpipe is not your job, and it is more likely the responsibility of your plumber. For the convenience of the readers, here is the full installation process of the drainpipe,


First, make a plan of where you want to locate the drain pipes, and the greatest thing to do is to consult the sanitary engineer because there are lots of critical measurements and elevations needed to assign all the systems. Measure the rough-in for the toilet and draw lines with chalk or pencil.


After the measurement, cut down the pipes according to the calculation and distance. They apply tape to measure the pipes. Cut the existing pipe and remove a length equal to the length of the sanitary tee or combo fitting. 


After cutting down the pipes, start gluing them with the pipe jointing adhesive. Apply some heat if needed to join the pipes ideally. cutting-down-the-pipes


When you are finished with all the formation, the next thing is to join the pipe with the exterior portion of the toilet. After joining the drainage pipe, check it by throwing some water or flushing the toilet. 

Can toilet drain pipes freeze or clog?

The drain pipes are prone to be clogged if you dispose of anything like hard napkins, plastics, indisposable tissue paper, and so on into the drainpipe. It will clog if you put these items here. In cold areas where the temperature goes down under 0 degrees, celsius can freeze the pipes and turn them into a chunk of ice.

What happens if a toilet drain pipe breaks?

It will cause a disaster if the drain pipe breaks apart. A broken drain pipe causes seepage, leakage, and infiltration of dirty liquids and wastes it touches. It will be an incredible mess, and many molds, viruses, and bacteria will be formed on the wall and the ceiling if the drain pipe gets damaged.toilet drain pipe breaks

How to fix the toilet drain pipe?

One thing in the world that you do not want to do is to fix the sewage line or the toilet drain pipe. It is a laborious process and should follow a sequence to fix it successfully, 

  • The initial thing to do is turn off the water supply line. Then carefully dethrone the toilet. For that, unscrew the bolt part and bolt caps. After loosening up the screws, you need to pull off the entire toilet and reserve it in a safe place.
  • Then pull the flange and wax ring out of place and replace the wax ring if possible. Use a saw to cut away the parts of the floor, 
  • Then unscrew the nuts to release the closet bend; you will find it inside the pipe. 
  • Then cut the new pipe according to the measurement and try to fit that with the adhesive item’s help. Then apply the elbow to the bending section. Push the bend into the pipe and tight that by applying tremendous pressure. 
  • After applying glue, let it be soaked for a while. Then reinstall the flange and wax ring and tight them with the bolts. Then carefully put the toilet over the flange.
  • Apply the bolt caps at the bottom of the toilet, turn on the water supply line, and perform flushing to check if everything has been installed without any flaws. You are done fixing the drain pipe if there is no leakage.

We are really lucky to have a hard-working, multi-skilled plumber on our team. Collin D. Gallegos, a professional plumber who has worked with us since 2012, is an expert in vent, septic, and drainage systems. He is a Certified Master Plumber and has worked on various commercial plumbing projects. He usually helps our readers resolve plumbing and pipe-related issues with a proper DIY troubleshooting and repair guide.

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