What Size Drain Does A Toilet Need

The drain pipe connects to the flange which mounts the toilet itself and this flange is usually built to connect to 3 inch schedule 40 toilet drain pipe.

What size drain does a toilet need. Toilet vent option 1. The drain in the toilet bowl is basically a p trap. You ll now need a section of pvc pipe that ll extend at the very minimum of 4 inches above the weir located in the toilet s trap and into the tee. Regardless of your plumbing code the minimum drain size for a toilet is 3 inches.

It s the same with sinks and tubs. The next measurement you need to know is. That s the minimum you can have more. If the drain lines in your home have poor venting as in figure a for example water rushing down the drains will pull water from nearby p traps.

Attach a pvc reducer in the port of the tee. Because that drain line is below the level of the toilet gravity pulls the contents of the waste line into it. When flushed a normal toilet sends waste through a trap into a waste line and onto the main drain line to the sewer or septic tank. If the drain line runs away from the wall where you want the vent use a reducing y and a 45 degree street elbow to point the vent line toward the wall.

If the toilet drain does not connect directly to a vent you must find another way to vent it. This hole is centered for most toilets 12 inches from the rear wall behind where the toilet will sit. There should also be at least 15 inches from the center of the hole to the walls on either side. Water closet s flushing 1 6 gallons or less are rated at 3 dfus drainage fixture units.

This reducer will change the overall size of the drainpipe to accommodate to the size of the studor vent. What size are toilet waste drains. This measurement is 15 inches. Some older model toilets flushing over 1 6 gallons per flush are rated at 4 dfus.

As water goes down a drain air is needed to equalize the pressure in the drain line. Take a pvc. So looking at the toilet make sure there are at least 15 inches of clearance from the center of the toilet to any adjacent fixture or wall. Again use pvc glue to do this.

This is the purpose of a venting system. The number of units on one drain pipe helps to calculate the size of pipe needed. A toilet is considered as six units because of how much water it discharges at once. Waste drain pipes for toilets in modern plumbing systems are either 3 inches or 4 inches in diameter.

The wider the pipe the more waste it can move and the. The toilet s drain size. The clearance from the center of the toilet to any adjacent fixture or sidewall.