1. A. Trap Size. 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 given in Table 723.A of this code.
2. B. Relation to Fixture Drains. A trap shall not be larger than the fixture drain to which it is connected.

3. C. Type of Traps. Traps shall conform with the following requirements.

   1. 1. Fixture traps shall be self-cleaning, other than integral traps and drum traps, without partitions or movable parts, except as specifically approved in other Sections of this Chapter.
   2. 2. Slip joints may be used on both sides of the trap and in the trap seal.
   3. 3. A trap which is integral with the fixture shall have a uniform interior and a smooth waterway.

4. D. Drum Traps. The use of drum traps shall comply with the following requirements:

   1. 1. Drum traps shall be limited to special fixtures wherein the capture of solids (e.g., broken teeth, fillings, etc., from dental cuspidors) is desired so that such solids can be removed before they escape into the downstream drainage system. Drum traps are subject to approval by the plumbing official. The body of the drum trap shall be not less than 4-inch diameter and shall have a water seal of not less than 2 inches (51 mm).
   2. 2. The trap screw of the drum trap/drum trap cover shall be one size less than the body of the drum trap's diameter.

5. E. Trailer Traps. Mobile/manufactured homes and travel trailers shall be provided with a trailer trap in the building sewer/sewer lateral immediately downstream of the mobile/manufactured home or travel trailer drain outlet connection. The trailer trap shall be individually vented and the vent shall be located downstream of the trap at a distance in accord with Table 913.A, Section 913.D and Section 1001.E.4 of this code. Running traps are prohibited for this installation. See diagram under §1523.A or §1623.A of this code.

   1. 1. Exception. The trailer trap for a mobile/manufactured home or travel trailer is not required to be provided with an individual vent if the mobile/manufactured home or travel trailer is connected to a park drainage system constructed in accord with §1613.G or §1515.G of this code and the building sewer/sewer lateral is no longer than 30 feet (9144 mm) from the main park drainage sewer main. For this individual vent exception to apply, the building sewer/sewer lateral shall enter the main park drainage sewer main on the horizontal such that an "S" trap or an effective "S" trap is not created. See §§1515.J and 1613.E.1 of this code.

      Figure 1003.ETrailer Trap and Vent

Authority Note

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

Historical Note

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2868 (November 2012).