I have seen both.
3 or 4 inch
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.
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.
Benjamin Andrew Hunt (Age 3 3/4, Height 1cm)
a home typically has a 4" main drain and that is enough. if it is not 4" you should get a plumbing code and do the math. Can you add a second 3-inch wasteline to an existing 3-inch main house wasteline in order to add the 3rd bath and toilet (this is obviously a 1950's house)?
3 or 4 inch
A shower drain is 1 1/2 or 2 inch and a toilet needs to be either 3 or 4 inch.
Un huh performed all the time
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.
Any vent is usually the size of the drain or waste pipe it is connected to. 3 or 4 inch on a toilet.
For a standard toilet installation, you will typically need a wax ring with a 3 or 4-inch diameter. Make sure to check the specific requirements of your toilet model before purchasing.
Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.
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.
To replace a toilet flapper for a 4-inch toilet, first turn off the water supply to the toilet. Remove the old flapper by disconnecting it from the flush valve. Install the new flapper by attaching it to the flush valve. Turn the water supply back on and test the flush to ensure it is working properly.
To replace a 4-inch toilet flapper in a toilet, first shut off the water supply to the toilet. Remove the old flapper by disconnecting it from the flush valve. Install the new flapper by attaching it to the flush valve and ensuring a secure fit. Turn the water supply back on and test the toilet to ensure the flapper is working properly.
The recommended height for a toilet flange to be installed above the floor is typically around 1/4 inch to 1/2 inch.
3/4 inch 3/4" 0.75 inch 0.75"