(See Note A-7.2.3.1.(1) and (3))
(1)
Except as provided in Sentence 7.4.6.3.(6), running thread and packing nut connections and unions with a gasket seal shall not be used downstream of a trap weir in a drainage system or in a venting system.
(2)
Slip joints shall not be used
(a)
in a venting system, or
(b)
in a drainage system, except to connect a fixture trap to a fixture drain in an accessible location.