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Normally 3" BUT if your using a sewerage ejector you can go with a 2" grinder pump if properly vented

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Q: What is the minimum diameter of a toilet drain pipe?
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Related questions

Do you glue the toilet flange into the toilet drain?

Usually toilet flange is glued down onto plastic drain pipe. There is a toilet flange that can be glued inside of plastic drain pipe also.


What do a toilet drain look like in basement?

A large black pipe, 3-4 inches diameter. Start by looking directly under the toilet -you will see it. It's the biggest pipe under your house.


Is the toilet drain pipe a big job to move and can you use a shower drain instead?

This can be a complicated job as the toilet drain ranges from 3" -4" and a variety of materials from Plastic to cast iron to galvanized. Then there is the venting to consider and NO a shower drain CANNOT be used for a toilet discharge as the shower drain is normally 2" diameter


How can you fix a clogged toilet that runs in the bathtub?

It's not the toilet, there's a blockage in the pipes some where after the drain pipe from the toilet joins up with the drain pipe from the tub.You're going to need to have the pipe snaked.


How large of a hole to cut out of floor for toilet drain for a second floor addition?

depends on the size of drain piping. Most toilet either have a 3" or 4" drain. The size hole needed would be larger than the outside diameter of the piping. 3" pipe=4" hole / 4" pipe=5" hole


Do you connect a downstairs toilet to an existing stench pipe or go straight into the drain?

It depends on the configuration of the pipe. It must be a minimum of 3" pipe and the configuration of how it is hooked up must allow for the toilet to be vented and must not disrupt the venting of other fixtures. Call a plumber.


How close to the concrete do I cut a drain pipe to install a toilet?

On a standard toilet in America the drain is 12 inches from the back wall to the center of the drain.


Does the toilet pipe lead to the same place as the kitchen sink?

In the end, yes. ANS 2 - By "the toilet pipe" -I'm going to assume you mean the drain . -The toilet drain in a small house is generally the main drain. All other drains are connected to it.


What is wrong if the sink and the bathtub will drain but the toilet wont flush?

The toilet itself is plugged or the pipe from the toilet to the drain is plugged. It may be that the tub and sink have their own drain pipe that may connect to the main away from the toilet drain. Plunge the toilet or sometimes if you fill a 5 gallon bucket with water and pour it into the toilet as fast as it will take it, that will flush out the line. It is a greater amount of water all at once an forces out what the clog is.


What is pipe bore?

Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.


How do you Cut toilet drain pipe installed to match new tile floor?

Inside pipe cutter


Can you install a toilet on an existing shower drain?

You need at least a 3 in. pipe -- shower is 2 in. pipe