Type of Fixture

D.F.U./Fixture (Load)

Minimum Size of Trap² (inches)

Bathroom groups:

1 tank water closet, 1 lavatory

with 1¼ inch trap and 1

bathtub¹ or shower stall

7

1¼

1 water closet with flush valve, 1

lavatory with 1¼ inch trap and 1

bathtub or shower¹

11

Bathtub (with or without overhead shower)¹

2

1½

Bathtub¹

3

2

Bidet

2

1½

Clothes washer, automatic

3

2

Dental unit or cuspidor

1

1¼

Drinking fountain

½

1

Dishwasher², domestic

2

1½

Floor drains

See Appendix A, Table F

2

Lavatories:

Lavatory

1

1¼

Lavatory

2

1½

Lavatory, barber, beauty parlor

2

1½

Lavatory, dental

1

1¼

Lavatory, surgeon's

2

1½

Laundry tray (1 or 2 compartments)

2

1½

Type of Fixture

D.F.U./Fixture (Load)

Minimum Size of Trap² (inches)

Shower stall

3

2

Showers (group) per head²

3

2

Sinks:

Combination sink and tray

3

1½

Combination sink and tray with

food-disposal unit

4 Separate Traps

1½

Flushing rim (with valve)

8

3

Kitchen sink, domestic

2

1½

Kitchen sink, domestic, with food-waste

grinder

3 Separate Traps

1½

Pot, scullery, etc.²

4

1½

Service (P trap)

3

3

Service (P trap)

2

2

Surgeon's

3

1½

Wash sink² (circular or multiple),

each set of faucets

2

1½

Urinals:

Urinal, pedestal, siphon jet, blowout

8

2

Urinal stall

3

2

Urinal, wall integral trap

3

2

Urinal, wall P trap, exposed

2

1½

Water closets:

Tank operated

4

3

Valve-operated

8

3

¹A shower head over a bathtub does not increase the fixture value.

²See Appendix A:  Table F and Section 890.1330(b) for method of determining unit values of fixtures not listed in this Table or for rating of devices with intermittent flows.