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Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS

402.6 Flanged Fixture Connections.

California Plumbing Code (Title 24, Part 5) · 2019 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

Fixture connections between drainage pipes and water closets, floor outlet service sinks and urinals shall be made using an approved copper alloy, hard lead, ABS, PVC, or iron flanges caulked, soldered, solvent cemented; rubber compression gaskets; or screwed to the drainage pipe. The connection shall be bolted with an approved gasket, washer, or setting compound between the fixture and the connection. The bottom of the flange shall be set on an approved firm base.

Wall-mounted water closet fixtures shall be securely bolted to an approved carrier fitting. The connecting pipe between the carrier fitting and the fixture shall be an approved material and designed to accommodate an adequately sized gasket. Gasket material shall be neoprene, felt, or similar approved types.

402.6.1 Closet Rings (Closet Flanges). Closet rings (closet flanges) for water closets or similar fixtures shall be of an approved type and shall be copper alloy, copper, hard lead, cast-iron, galvanized malleable iron, ABS, PVC, or other approved materials. Each such closet ring (closet flange) shall be approximately 7 inches (178 mm) in diameter and, where installed, shall, together with the soil pipe, present a 1 1 ⁄2 inch (38 mm) wide flange or face to receive the fixture gasket or closet seal.

2019 CALIFORNIA PLUMBING CODE 57

PLUMBING FIXTURES AND FIXTURE FITTINGS any other purpose or distributed to any other persons or parti es.

Caulked-on closet rings (closet flanges) shall be not less than 1 ⁄4 of an inch (6.4 mm) thick and not less than 2 inches (51 mm) in overall depth.

Closet rings (closet flanges) shall be burned or soldered to lead bends or stubs, shall be caulked to cast-iron soil pipe, shall be solvent cemented to ABS and PVC, and shall be screwed or fastened in an approved manner to other materials.

Closet bends or stubs shall be cut-off to present a smooth surface even with the top of the closet ring before the rough inspection is called.

Closet rings (closet flanges) shall be adequately designed and secured to support fixtures connected thereto. 402.6.2 Securing Closet Flanges. Closet screws, bolts, washers, and similar fasteners shall be of copper alloy, copper, or other listed equally corrosion-resistant materials. Screws and bolts shall be of a size and number to properly support the fixture installed. 402.6.3 Securing Floor-Mounted, Back-Outlet Water Closet Bowls. Floor-mounted, back-outlet water closet bowls shall be set level with an angle of 90 degrees (1.57 rad) between the floor and wall at the centerline of the fixture outlet. The floor and wall shall have a flat mounting surface not less than 5 inches (127 mm) to the right and left of the fixture outlet centerline. The fixture shall be secured to the wall outlet flange or drainage connection and the floor by corrosion-resistant screws or bolts. The closet flange shall be secured to a firm base.

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. ▸Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
    Overview
    1. 401.2 Quality of Fixtures. Plumbing fixtures shall be construc…
    2. 401.3 Water-Conserving Fixtures and Fittings.Note 1: [BSC, DSA…
    3. 402.2 Joints. Where a fixture comes in contact with the wall
    4. 402.3 Securing Fixtures. Floor-outlet or floor-mounted
    5. 402.4 Wall-Hung Fixtures. Wall-hung fixtures shall be
    6. 402.5 Setting. Fixtures shall be set level and in proper align…
    7. 402.6 Flanged Fixture Connections. Fixture connections between…
    8. 403.2 Fixtures and Fixture Fittings for Persons with
    9. 403.3 Exposed Pipes and Surfaces. Water supply and
    10. 404.2 Overflows. Where a fixture is provided with an overflow,…
    11. 405.2 Prohibited Urinals. Trough urinals and urinals with
    12. 405.3 Miscellaneous Fixtures. Fixed wooden, or tile
    13. 402.7 Supply Fittings. The supply lines and fittings for
    14. 402.8 Installation. Fixtures shall be installed in accordance
    15. 402.9 Design and Installation of Plumbing Fixtures. Plumbing f…
    16. 402.10 Slip Joint Connections. Fixtures having concealed slip …
    17. 402.11 Future Fixtures. Where provisions are made for the
    18. 406.2 Special Use Sinks. Restaurant kitchen and other
    19. 406.3 Special Use Fixtures. Special use fixtures shall be
    20. 406.4 Zinc Alloy Components. Zinc alloy components
    21. 407.2 Water Consumption. The maximum water flow rate of
    22. 407.4 Transient Public Lavatories. Self-closing or metering fa…
    23. 407.5 Waste Outlet. Lavatories shall have a waste outlet
    24. 407.6 Overflow. Where overflows are provided, they shall
    25. 408.2 Water Consumption. Showerheads shall have a
    26. 408.3 Individual Shower and Tub-Shower Combina-tion Control Va…
    27. 407.3 Limitation of Hot Water Temperature for PublicLavatories…
    28. 408.4 Waste Outlet. Showers shall have a waste outlet and
    29. 408.5 Finished Curb or Threshold. Where a shower
    30. 408.7 Lining for Showers and Receptors. Shower
    31. 408.6 Shower Compartments. Shower compartments,
    32. 408.8 Public Shower Floors. Floors of public shower
    33. 408.9 Location of Valves and Heads. Control valves and
    34. 408.10 Water Supply Riser. A water supply riser from the
    35. 409.2 Waste Outlet. Bathtubs and whirlpool bathtubs shall
    36. 409.3 Overflow. Where overflows are provided, they shall
    37. 409.4 Limitation of Hot Water in Bathtubs and
    38. 409.5 Backflow Protection. The water supply to a bathtub
    39. 409.6 Installation and Access. Bathtubs and whirlpool
    40. 410.2 Backflow Protection. The water supply to the bidet
    41. 410.3 Limitation of Water Temperature in Bidets. The
    42. 411.0 Water Closets.411.1 Application. Water closets shall com…
    43. 411.2 Water Consumption. The effective flush volume of
    44. 411.3 Water Closet Seats. Water closet seats shall be properly…
    45. 411.4 Personal Hygiene Devices. Water closets with integral pe…
    46. 412.0 Urinals.412.1 Application. Urinals shall comply with ASME
    47. 412.2 Backflow Protection. A water supply to a urinal
    48. 413.2 Flushometer Valves. Flushometer valves and
    49. 413.3 Flush Tanks. Flush tanks for manual flushing shall
    50. 413.4 Water Supply for Flush Tanks. An adequate quantity of wa…
    51. 413.5 Overflows in Flush Tanks. Flush tanks shall be provided …
    52. 414.2 Backflow Protection. The water supply connection
    53. 414.3 Drainage Connection. Domestic dishwashing
    54. 415.0 Drinking Fountains.415.1 Application. Drinking fountains…
    55. 415.2 Drinking Fountain Alternatives. Where food is
    56. 415.3 Drainage Connection. Drinking fountains shall be
    57. 415.4 Location. Drinking fountains shall not be installed in
    58. 416.2 Water Supply. Emergency eyewash and shower
    59. 416.3 Installation. Emergency eyewash and shower equipment sha…
    60. 416.4 Location. Emergency eyewash and shower equipment shall b…
    61. 416.5 Drain. A drain shall not be required for emergency
    62. 417.0 Faucets and Fixture Fittings.417.1 Application. Faucets …
    63. 417.2 Deck Mounted Bath/Shower Valves. Deck
    64. 417.3 Handheld Showers. Handheld showers shall comply
    65. 417.4 Faucets and Fixture Fittings with Hose Con-nected Outlet…
    66. 417.5 Separate Controls for Hot and Cold Water. Where two sepa…
    67. 418.2 Strainer. Floor drains shall be considered plumbing
    68. 418.3 Location of Floor Drains. Floor drains shall be
    69. 418.4 Food Storage Areas. Where drains are provided in
    70. 418.5 Floor Slope. Floors shall be sloped to floor drains.
    71. 419.2 Drainage Connection. Approved wye or other
    72. 419.3 Water Supply. A cold water supply shall be provided
    73. 420.2 Water Consumption. Sink faucets shall have a maximum flo…
    74. 420.3 Pre-Rinse Spray Valve. Commercial food service
    75. 420.4 Waste Outlet. Kitchen and laundry sinks shall have
    76. 421.2 Strainers. The waste outlet of a floor sink shall be
    77. 422.2 Separate Facilities. Separate toilet facilities shall
    78. 422.0 Minimum Number of Required Fixtures.422.1 Fixture Count.…
    79. 422.3 Fixture Requirements for Special Occupan-cies. Additiona…
    80. 422.4 Toilet Facilities Serving Employees and Cus-
    81. 422.5 Toilet Facilities for Workers. Toilet facilities shall
    82. 422.6 [CA] Cosmetology. Each school shall provide pub-
    83. 422.7 [CA] Cosmetology Establishments. Each estab-
    84. 422.8 [DPH] Commissaries Serving Mobile FoodPreparation Units.…
    85. 422.9 [DPH] Employee Lavatories in Food Establish-ments. Emplo…
  5. Chapter 5 — WATER HEATERS
  6. Chapter 6 — WATER SUPPLY AND DISTRIBUTION
  7. Chapter 7 — SANITARY DRAINAGE
  8. Chapter 8 — INDIRECT WASTES
  9. Chapter 9 — VENTS
  10. Chapter 10 — TRAPS AND INTERCEPTORS
  11. Chapter 11 — STORM DRAINAGE
  12. Chapter 12 — FUEL GAS PIPING
  13. Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
  14. Chapter 14 — FIRESTOP PROTECTION
  15. Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
  16. Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
  19. Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
  20. Appendix C — ALTERNATE PLUMBING SYSTEMS
  21. Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
  22. Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
  23. Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS
  25. Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
  26. Appendix I — INSTALLATION STANDARD FOR PEX TUBING SYSTEMS FOR …
  27. Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
  28. Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
  29. Appendix L — SUSTAINABLE PRACTICES
  30. Appendix M — PEAK WATER DEMAND CALCULATOR

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