Water Closet Drain Pipe Size

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.

Water closet drain pipe size.

Table 710 1 2 horizontal fixture branches and stacks a diameter of pipe inches. The waste for the water closet should be 4 in. The minimum size of any building drain serving a water closet shall be 3 inches. 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. 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.

Lead bend the pipe or bend being wiped to a brass ferrule which is caulked into the soil pipe and the floor connection generally being made by means. Some older model toilets flushing over 1 6 gallons per flush are rated at 4 dfus. Remember that the bottom of the flange must be set on top of the finished flooring and then screwed into the subfloor. That said we put together the following tables to serve as general guides for estimating a pipe s water flow capacity.

The drainpipes are made of cast iron galvanized pipe copper or plastic. The drainpipes collect the water from sinks showers tubs and appliances. Regardless of your plumbing code the minimum drain size for a toilet is 3 inches. A reduced size flexible water connector installed between the supply pipe and the fixture shall be of an approved type.

The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. The toilet s drain size. Connections for water closet. The supply pipe shall extend to the floor or wall adjacent 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. The drain pipe in your toilet carries waste away into the home s main drain line. Water closet s flushing 1 6 gallons or less are rated at 3 dfus drainage fixture units. Lead pipe or a 4 in.

Water flow gpm gph based on pipe size and inside outside diameters. When cast iron soil pipe is used the connection is made by means of 4 in. The wider the pipe the more waste it can move and the. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter.

The standard size for a toilet drain pipe is 3 inches in diameter but drains up to 4 inches in diameter are often used.