What size pipe for toilet supply line?
Typically they are 3/8” in diameter, but toilet supply line size can vary in length, usually anywhere from 9” to 20”. Measure for accuracy to ensure you are buying a part that will match your installation.
A three-inch pipe is what's used in homes to pipe toilets. The four-inch pipe is used as the building drain under floors or in crawlspaces to transport all the wastewater from a home out to the septic tank or sewer. The four-inch pipe may also be used in a home if it's capturing two or more bathrooms.
The standard rough-in size for a toilet is 12 inches in contemporary houses and 10 inches in older homes. These are the toilet rough-in dimensions: Supply line (vertical): 8 1/4 inches of height to accommodate most base moldings. Supply line (horizontal): 6 inches maximum to either side of the toilet centerline.
3” is the most common size pipe for most homes. If your aim is good, you can use a piece of pipe as a toilet.
If it is an outlet size (from base of toilet to a Sewer Line, you need to replace all of the 2 inch line with the size of the toilet discharge (usually 3 inches). A 2 inch outlet on a toilet will clog the first time you use it. It is too small.
The size of the pipe for a toilet drain is typically 3 inches (7.62 cm) in diameter. This size is commonly used for residential toilet drainage systems.
Knowing the correct rough-in size will ensure your toilet will fit and work correctly. To measure the rough-in for your toilet, measure from the wall behind to the toilet to the middle of the closet bolt caps on your current toilet. The closet bolts are the bolts holding your toilet to the floor.
The pipe that connects a toilet pan to the wall or plumbing is called a flush pipe, and the rubber part on the end is called a flush cone.
Most codes require at least 15 inches (measured from the center of the toilet) from any side wall or obstruction and not closer than 30 inches center to center to any other sanitary fixture. (The NKBA actually recommends 32 inches.) There should be at least 24 inches of clear space in front of a toilet or bidet.
PVC is commonly used for the drain lines of sinks, toilets and bathtubs. Other common applications include indoor plumbing, underground plumbing, vent stacks, main water supply lines, high-pressure piping, and storm drainage systems.
How many toilets can go in 3 inch pipe?
No more than four water closets or bathroom groups shall be installed on a 3" horizontal fixture branch. EXCEPTION: Where the water closets are rated 3.5 gallons or more per flush, no more than two water closets or bathroom groups shall be permitted.
Eyeball it
Look at the flush valve drain opening at the bottom of your tank. If the opening looks about the size of a baseball or orange, you need a 2″ flapper. If the opening looks about the size of a softball or grapefruit, you need a 3″ flapper.
Braided Nylon Flex Tubes
This type of water supply tube is good for use with either hot or cold water supply lines. They can be used for most fixtures, including faucets, toilets, and more.
You probably know that drains need to flow downhill into your sewer. But do you know the proper slope? The ideal slope of any drain line is ¼ inch per foot of pipe. In other words, for every foot the pipe travels horizontally, it should be dropping ¼ inch vertically.
The size of PVC pipe you should use for a drain will depend on where you're using it in your plumbing. Main sewer lines need to be at least 4 inches in diameter, but other drains will have smaller pipes.
A 3-inch sanitary waste line is sufficient for one bathroom group (toilet, lavatory, tub/shower) but a whole single-family house tends to have a 4-inch default size, at least entering the building.
| DIAMETER OF PIPE (inches) | MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu) | |
|---|---|---|
| 2 | 6 | 6 |
| 21/2 | 12 | 9 |
| 3 | 20 | 20 |
| 4 | 160 | 90 |
While a 10-inch rough-in toilet can plausibly fit into a 12-inch rough-in (though a longer connector may be needed), the same cannot be said for using a 12-inch rough-in toilet in a 10-inch rough-in. A 12” rough-in toilet will not fit in a bathroom with a 10” rough-in size.
“What does 12-inch rough-in mean for a toilet?” That means there is 12-inches between the center of the toilet flange to the finished back wall. This information can be found on the toilet's specification sheet.
All plumbing fixtures with a trap need venting, and without proper venting, the plumbing won't perform well. You'll hear horrible gurgling sounds when you flush the toilet. The vent is a pipe that connects horizontal drain lines to the exterior air above.
How far should toilet waste pipe be from wall?
How far should the toilet waste pipe be from the wall? This is called your 'toilet rough-in' distance, meaning the distance from the wall to the centre of the waste pipe. Most toilets have a rough-in of 12 inches, although older homes can have 10 or 14 inches.
What is it exactly? The pipe coming out the top of your roof is a plumbing vent, and it plays an important role in helping your plumbing work properly and keeping your home free from methane gas.
Basically: Soil Pipes are designed to transport the soiled water (blackwater) from your toilet, urinal, or bidet (if you're fancy). Waste Pipes are designed to transport the wastewater (greywater) from your sinks, shower, bath, washing machine, or dishwasher.
Use a 90-degree elbow or stub-out fitting to insert the water line into the surface plane of the wall. Be sure to make it parallel to and 8 inches above the floor surface.
The optimum flange height to aim for is 1/4 inch above the finished floor. This typically allows for almost any type of wax ring to be used and still ensure a good seal. If you recently tiled or changed the bathroom flooring, the flange height is likely less than optimal.
ADA Compliance: Space is needed to allow for easier maneuverability for patrons in a wheelchair. The gap allows toe space for wheelchair users which allows more room to move within the stalls. 9″ minimum toe space is required per ADA guidelines.
Soil Pipes - 110mm for toilets, urinals, bidets, and soil stacks. Waste Pipes - 32mm for small hand basins, 40mm for sinks, showers, baths, washing machines and dishwashers, 50mm for commercial applications and connecting multiple waste pipes to a single flow.
A majority of toilets will use the two inch flapper; however three inch flappers have become popular in recent years and can be found in newer toilets manufactured since 2005. An easy reference for determining your toilet's flapper size is to look at the flush valve drain opening at the bottom of your tank.
In short, it is possible to connect the toilet drainage line and the shower drainage line, as long as they both have separate waste trap arms. However, do note that combining them may also lead to blockages, which can cause smells to come from certain drains.
Oversized piping may contribute to health risks such as Legionella, sewage clogs, and odor fade. As time moves forward, plumbing fixtures and the use of plumbing systems changes, and new risks are discovered and studied.
How far can a toilet be from a vent stack?
For pipes that have a diameter of 3 inches the distance is 6 feet and for a 4-inch pipe the most it should be away from the vent is 10 feet. Keep in mind that toilets have their own traps so there is no need to have one on the drain line, but it still must have a vent.
In general, the maximum distance of the toilet from the main drain should not exceed 4 meters, with a 2% minimum slope. Within these limits, the plumbing system can guarantee an effective draining, avoiding bad smells and the problem of emptying the siphons.
Because of their connected frame, one-piece toilets are easier to clean and maintain. Two-piece toilets tend to accumulate more bacteria in the space between the tank and bowl, which makes them harder to clean and the upkeep more time-consuming.
No more than four water closets or bathroom groups shall be installed on a 3" horizontal fixture branch. EXCEPTION: Where the water closets are rated 3.5 gallons or more per flush, no more than two water closets or bathroom groups shall be permitted.
Safest: Copper Pipes for Drinking
It may come as a surprise but copper is one of the best materials for pipes when it comes to clean drinking water. In particular, you should look for copper pipes that have lead-free joint materials. This combination is very long-lasting and durable.
1-inch pipe: 210 gallons per minute. 2-inch pipe: 850 gallons per minute. 3-inch pipe: 1,900 gallons per minute. 4-inch pipe: 3,400 gallons per minute.
