Each trap, except for
traps within an interceptor or similar device shall be self-cleaning.
Traps for bathtubs, showers, lavatories, sinks, laundry
tubs, floor drains, urinals, drinking fountains, dental units,
and similar fixtures shall be of standard design, weight and
shall be of ABS, cast-brass, cast-iron, lead, PP, PVC, or other
approved material. An exposed and readily accessible drawn-copper
alloy tubing trap, not less than 17 B & S Gauge (0.045
inch) (1.143 mm), shall be permitted to be used on fixtures
discharging domestic sewage.
Exception:
- Drawn-copper alloy tubing traps shall not be used for urinals. Each trap shall have the manufacturer's name stamped legibly in the metal of the trap, and each tubing trap shall have the gauge of the tubing in addition to the manufacturer's name. A trap shall have a smooth and uniform interior waterway.
- [HCD 1 & HCD 2] Non-water supplied urinals conforming to ASME A112.19.19-2016, Standard for Vitreous China Nonwater Urinals, or reference standards in Table 1701.1 for non-vitreous ceramic or plastic urinal fixtures.
A maximum of one approved
slip joint fitting shall be permitted to be used on the outlet
side of a trap, and no tubing trap shall be installed without a
listed tubing trap adapter. Listed plastic trap adapters shall be
permitted to be used to connect listed metal tubing traps.
The size (nominal diameter) of a trap for a
given fixture shall be sufficient to drain the fixture rapidly
but in no case less than nor more than one pipe size larger
than given in Table 702.1. The trap shall be the same size as
the trap arm to which it is connected.