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Normally 11/2" DEPENDING on developed length of piping and fittings

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Q: What is the minimum pipe size to vent a toilet?
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What size vent is needed for a toilet 2in 3in etc?

Any vent is usually the size of the drain or waste pipe it is connected to. 3 or 4 inch on a toilet.


Can the vent pipe for the toilet have an elbow in it?

Yes.


Do you have to put a vent pipe right behind a toilet?

Who needs a toilet


What size went is needed on the toilet drain?

2" VENT. Many codes say the vent can be 1/2 the size of the pipe being served but in no case less then 11/2" and considering a lead bend (toilet drain) can be 3" and the new fixtures have 1.6 GPF in lieu of the 3.5 GPF a 11/2 vent pipe is fine


Can a toilet be plumbed into the house stench pipe?

No, that is why it is called a vent pipe not a soil line


Can you connect a new toilet to an older toilet vent?

Yes if the vent pipe is 4" and vertical by code and there is nothing connected between your toilet tee and where you would connect your new toilet tee. If not worried about codes then yes you can connect to a 3" vent line if no other vent lines are connected down stream. If you have a vent pipe that is less then 3" and or you have other vents connected between your old toilet tee and your new toilet tee then NO you can not connect a new tee for your toilet.


How do you eliminate vacuum in toilet vent pipe?

1-Clear the obstruction from the vent or drain pipe 2-Be sure the vent is properly sized and graded up towards the penetration of the roof, or where it ties into the vent stack.


What size pipe do I need for my new toilet?

Normally 11/2" vent and a 3" soil line=BUT some codes want a 4" waste and then a 2" vent may be required depends on the local inspector=


Do you need a vent on your toilet waste pipe our waste pipe goes in to the loft which is connected to a vent on the roof tiles I want to cut the pipe back to about 3 foot high can I just blank it off?

No, it has to be vented


You have condensation in your toilet vent pipe?

No I just checked and mine has no condensation, thanks fro asking


Where to install plumbing air vent?

The highest 4 inch pipe should have a vent on it, or directly above a toilet junction Above the flood level rim of the fixture it is servicing IT does not mean the toilet


When an upstairs toilet or shower is drained the basement toilet gurgles and drains when you flush the basement toilet at any time it's a VERY lazy flush unless you lightly-tip it off the wax?

Your vent pipe for that part of the plumbing is either blocked or non-existent. Having to tip the toilet off center slightly is letting air enter into the system, something that should be happening under normal conditions if the vent pipe were working properly. That vent pipe needs to be snaked out and cleaned.