er of small fixtures
1-1/4-inch 1
1-1/2-inch 2
2 -inch 3 to 8
2-1/2-inch 9 to 20
3 -inch 21 to 44

If building is ten (10) or more stories in height, the
vertical waste pipe shall not be less than 3 inches in
diameter. The use of wrought-iron pipe for waste pipe 2 inches
or less in diameter is prohibited.

The size of traps and waste branches, for a given fixture,
shall be as follows:

---------------------------------------------+------------------
| Size in inches
Kind of fixtures +-------+----------
| Trap | Branch
---------------------------------------------+-------+----------
Water closet | 3 | 4
Slop sink with trap combined | 3 | 3
Slop sink ordinary | 2 | 2
Pedestal urinal | 3 | 3
Floor drain or wash | 4 | 4
Yard drain or catch basin | 4 | 4
Urinal trough | 2 | 2
Laundry trays, two or five | 2 | 2
Combination sink and tray (for each fixture) | 1-1/2 | 2
Kitchen sinks, small | 1-1/2 | 1-1/2
Kitchen sinks, large hotel, etc. | |
Kitchen sinks, grease trap | | 2
Pantry sinks | 1-1/2 | 1-1/2
Wash basin, one only | 1-1/4 | 1-1/4
Bath tub | 2 | 2
Shower baths | 1-1/2 | 1-1/2
Shower baths, floor | 2 | 2
Sitz bath | 1-1/2 | 1-1/2
Drinking fountains | 1-1/4 | 1-1/4
---------------------------------------------+-------+----------

SEC. 25. OVERFLOW PIPES.--Overflow pipes from fixtures must in
all cases be connected on the inlet side of the traps.

SEC. 26. SETTING OF TRAPS WITHOUT RE-VENT.--All traps must be
substantially supported and set true with respect to their