water levels. No pot, bottle or "D" trap will be permitted nor
any form of trap that is not self-cleaning, nor that has
interior chambers or mechanism nor any trap except earthenware
ones that depend upon interior partitions for a seal. In case
there is an additional fixture required in building and it is
impossible to re-vent pipe for the trap, the building
department may designate the kind of trap to be used. This
shall not be construed to allow traps without re-vents in new
buildings.

SEC. 27. SAFE AND REFRIGERATOR PIPES.--Safe-waste pipes must
not connect directly with any part of the plumbing system.
Safe-waste pipes must discharge over an open, water-supplied,
publicly-placed, ordinary-used sink, placed not more than
3-1/2 feet above the cellar floor. The safe waste from a
refrigerator must be trapped at the bottom of the line only
and must not discharge upon the ground floor, but over an
ordinary open pan, or some properly-trapped, water-supplied
sink, as above. In no case shall the refrigerator waste pipe
discharge into a sink located in a living room.

The branches on vertical lines must be made by means of "Y"
fittings and be carried to the safe with as much pitch as
possible. Where there is an offset on the refrigerator waste
pipe in the cellar, there must be clean-outs placed. These
clean-outs must be of brass.

In tenement and lodging houses the refrigerator waste pipe
must extend above the roof, and not be larger than 1-1/2
inches and the branches not smaller than 1-1/4 inches.
Refrigerator waste pipes, except in tenement houses, and all
safe-waste pipes, must have brass flap valve on the lower
ends. Lead safes must be graded and neatly turned over beveled
strips at their edges.

SEC. 28. VENT-PIPE MATERIAL.--Material for vent pipes shall be
of lead, brass, enameled iron or galvanized iron.

SEC. 29. VENTILATION OF TRAPS AND SOIL LINES.--Traps shall be
protected from siphonage or air pressure by special vent pipes
of a size of not less than the following tables:

-----------------+----------------+-----------------------------
| Maximum | Number of traps vented
| length in feet |
Size of pipe +----------------+------------+----------------