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Are toilet drains 3 or 4 inch?

Updated: 9/24/2023
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10y ago

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I have seen both.

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10y ago
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Q: Are toilet drains 3 or 4 inch?
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Related questions

What size drain is required for a toilet?

3 or 4 inch


Can you install a toilet where a shower used to be?

A shower drain is 1 1/2 or 2 inch and a toilet needs to be either 3 or 4 inch.


Can you use a 4 inch toilet on a 3 inch drain?

Un huh performed all the time


How much slope per foot toilet drain?

All drains slope 1/4 inch per foot, minimum. Too much slope,though, can mean pulling water out of the trap or goose neck on a toilet.


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.


When adding another toilet 6 feet from an existing toilet do you need a new vent and would 3-inch pipe be sufficient?

where one toilet is draining to its own unshared line, the line can be 3" but once both toilets are draining to the same line, it needs to be 4". in other words, from the first toilet to the second toilet can be 3" but past the second toilet needs to be 4". there needs to be a vent downstream of the second toilet in the direction of flow if there is another fixture of any kind downstream of the two toilets.


You are working with a 3 inch PVC drain pipe and a 3 inch PVC flange and there is too much play as you insert the flange into the drain pipe?

Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.


Will the toilet install properly if the flange is higher than tile?

Depends on how much higher and how the toilet is made. They are not all the same. A PVC flange is supposed to be above the floor level and will clear. They are about 1/4 inch thick. You can probably get away with up to 3/8 of an inch, but any more than that and the toilet will rock on the drain and eventually leak.


How do you type three quarters of an inch?

3/4 inch 3/4" 0.75 inch 0.75"


Can a 4 inch ABS toilet drain pipe be reduced and connected to a 3 inch PVC without backflow problems I am unable to redo it all as 3 inch due to the way the house is built too much destruction.?

Firstly, i strongly recommend against you reducing the pipe because you will pick up blockages, i have seen it far too many times. Secondly, check with your state laws regarding the minimum size piping for the toilet discharge oultet pipe, most countries it will be 4 inch or 110mm, hence, toilets made with a 4 inch outlet.


How do you write 3 quarters inch?

You can write this as 3/4, or as 0.75.


What is the size of most sink drains?

The drain in the bathroom sink is 1 1/4 inch. However, the trap or the fitting on the wall may be 1 1/2 or 1 1/4 inch.