Water Closet Drain Pipe Size

Water closet s flushing 1 6 gallons or less are rated at 3 dfus drainage fixture units.

Water closet drain pipe size.

The drain pipe in your toilet carries waste away into the home s main drain line. Waste drain pipes for toilets in modern plumbing systems are either 3 inches or 4 inches in diameter. If you have questions please call our drain wizard at 800 635 0384. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter.

Lead pipe or a 4 in. The gasket tightens as the flange is turned in a clockwise rotation. In size but never less. The waste pipes remove water and material from the toilet.

The waste for the water closet should be 4 in. The wider the pipe the more waste it can move and the. Connections for water closet. When cast iron soil pipe is used the connection is made by means of 4 in.

Remember that the bottom of the flange must be set on top of the finished flooring and then screwed into the subfloor. The drainpipes collect the water from sinks showers tubs and appliances. What size are toilet waste drains. The minimum size of a fixture supply pipe shall be as shown in table 604 5 the fixture supply pipe shall terminate not more than 30 inches 762 mm from the point of connection to the fixture.

The third option is the pvc or abs replacement closet repair flange which also inserts into the vertical cast iron drain pipe after the old flange is removed. Water flow gpm gph based on pipe size and inside outside diameters. Compare the fixture to the minimum sizes of drainage pipe by fixture table. Regardless of your plumbing code the minimum drain size for a toilet is 3 inches.

Some older model toilets flushing over 1 6 gallons per flush are rated at 4 dfus. The minimum size of any building drain serving a water closet shall be 3 inches. The toilet s drain size. A reduced size flexible water connector installed between the supply pipe and the fixture shall be of an approved type.

That said we put together the following tables to serve as general guides for estimating a pipe s water flow capacity. 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. The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. The standard size for a toilet drain pipe is 3 inches in diameter but drains up to 4 inches in diameter are often used.

The supply pipe shall extend to the floor or wall adjacent to the fixture.