[Title 24 CFR 3280.606]
[Code of Federal Regulations (annual edition) - May 1, 2001 Edition]
[Title 24 - HOUSING AND URBAN DEVELOPMENT]
[Chapter Xx - OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING]
[Part 3280 - MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS]
[Subpart G - Plumbing Systems]
[Sec. 3280.606 - Traps and cleanouts.]
[From the U.S. Government Printing Office]


24HOUSING AND URBAN DEVELOPMENT52001-05-012001-05-01false3280.606Sec. 3280.606HOUSING AND URBAN DEVELOPMENTOFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSINGMANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDSPlumbing Systems
Sec. 3280.606  Traps and cleanouts.

    (a) Traps--(1) Traps required. Each plumbing fixture, except listed 
toilets, shall be separately trapped by approved water seal ``P'' traps. 
All traps shall be effectively vented.
    (2) Dual fixtures. A two-compartment sink, two single sinks, two 
lavatories, or a single sink and a single lavatory with waste outlets 
not more than 30 inches apart and in the same room and flood level rims 
at the same level may be connected to one ``P'' trap and may be 
considered as a single fixture for the purpose of drainage and vent 
requirements.
    (3) Prohibited traps. A trap which depends for its seal upon 
concealed interior partitions shall not be used. Full ``S'' traps, bell 
traps, drum traps, crown-vented traps, and running traps are prohibited. 
Fixtures shall not be double-trapped.
    (4) Material and design. Each trap shall be self-cleaning with a 
smooth and uniform interior waterway. Traps shall be manufactured of 
cast iron, cast brass, or drawn brass tubing of not less than No. 20 
Brown and Sharpe gage, or approved or listed plastic, or other approved 
or listed material. Union joints for a trap shall be beaded to provide a 
shoulder for the union nut. Each trap shall have the manufacturer's name 
stamped or cast in the body of the trap, and each tubing trap shall show 
the gage of the tubing.
    (5) Trap seal. Each ``P'' trap shall have a water seal of not less 
than 2 inches and not more than 4 inches and shall be set true to its 
seal.

[[Page 155]]

    (6) Size. Traps shall be not less than 1\1/4\ inches in diameter. A 
trap shall not be larger than the waste pipe to which it is connected.
    (7) Location. Each trap shall be located as close to its vent and to 
its fixture outlet as structural conditions will permit.
    (8) Length of tailpiece. The vertical distance from a trap to the 
fixture outlet shall not exceed 24 inches.
    (9) Installation. (i) Grade of trap arm. The piping between a ``P'' 
trap and the fixture tee or the vented waste line shall be graded \1/4\ 
inch per foot towards the vent and in no event shall have a slope 
greater than its diameter. The vent opening at fixture tees shall not be 
below the weir of the ``P'' trap outlet.
    (ii) Trap arm offset. The piping between the ``P'' trap and vent may 
change direction or be offset horizontally with the equivalent of no 
more than 180 degrees total change in direction with a maximum of 90 
degrees by any one fitting.
    (iii) Concealed traps. Traps with mechanical joints shall be 
accessible for repair and inspection.
    (iv) Removability of traps, etc. Traps shall be designed and 
installed so the ``U'' bend is removable without removing the strainers 
from the fixture. Continuous waste and tail pieces which are permanently 
attached to the ``U'' bend shall also be removable without removing the 
strainer from the fixture.
    (b) Cleanout openings--(1) Location of cleanout fittings. (i) 
Cleanouts shall be installed if the drainage system cannot be cleaned 
through fixtures, drains, or vents. Cleanouts shall also be provided 
when fittings of more than 45 degrees are used to affect an offset 
except where long turn ells are used which provide sufficient ``sweep'' 
for cleaning.
    (ii) A full size cleanout shall be installed at the upper end of any 
section of drain piping which does not have the required minimum slope 
of \1/4\ inch per foot grade.
    (iii) A cleaning tool shall not be required to pass through more 
than 360 degrees of fittings, excluding removable ``P'' traps, to reach 
any part of the drainage system. Water closets may be removed for 
drainage system access.
    (2) Access to cleanouts. Cleanouts shall be accessible through an 
unobstructed minimum clearance of 12 inches directly in front of the 
opening. Each cleanout fitting shall open in a direction opposite to the 
flow or at right angles to the pipe. Concealed cleanouts that are not 
provided with access covers shall be extended to a point above the floor 
or outside of the manufactured home, with pipe and fittings installed, 
as required, for drainage piping without sags and pockets.
    (3) Material. Plugs and caps shall be brass or approved or listed 
plastic, with screw pipe threads.
    (4) Design. Cleanout plugs shall have raised heads except that plugs 
at floor level shall have counter-sunk slots.

[40 FR 58752, Dec. 18, 1975. Redesignated at 44 FR 20679, Apr. 6, 1979, 
as amended at 58 FR 55014, Oct. 25, 1993]