Water Closet Pipe Size

Most toilet installation parts are made to fit these pipe sizes.

Water closet pipe size.

Water supply fixture units wsfu and minimum fixture branch pipe sizes. 304 8mm 1 gallon m 3 785l m. The closet bend is also 3 inch pipe however there are various closet bend sizes. The listed fixture unit values represent their load on the cold water building supply.

One end in most cases the inlet is 4 inches wide this mounts to the toilet and the outlet end is 3 inches in diameter. The supply pipe shall extend to the floor or wall adjacent to the fixture. The closet bend actually has two diameters because it connects the 3 inch drain pipe to the 4 inch drain line. 1 inch 25 4mm 1 ft.

Unit sizes provided in the table 1 and table 2 is in mm but the size of pipes in the chart is in inch. A reduced size flexible water connector installed between the supply pipe and the fixture shall be of an approved type. Appliances appurtenances and fixtures not referenced in the table below shall be permitted to be sized by reference to fixtures having a similar flow rate and frequency of use. The top of the closet bend is 3 inch diameter pipe while the other end is 4 inch.

Toilet water supply line 1 2 inch copper pipe or plastic pipe routed from main water line or 1 2 inch cold water line. This pipe fitting is set under the toilet in the floor joists or ground in toilets on concrete slabs. A reducing closet bend configuration or a 4 3 closet bend has two different sized ends to connect two different sized pipes. The closet bend installs below the toilet and connects to the main drain stack.

Closet bend 4 3 closet bend connects to 3 inch schedule 40 pipe. Water velocity should not be greater than 2 438m s at valve seat to prevent noise and erosion.