Connections Between Drainage Piping and Fittings
NYC Plumbing Code § PC 706
in effectSection PC 706: Connections Between Drainage Piping and Fittings
706.1 Connections and changes in direction.
All connections and changes in direction of the sanitary drainage system shall be made with approved drainage fittings. Connections between drainage piping and fixtures shall conform to Section 405.
706.2 Obstructions.
The fittings shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping. Threaded drainage pipe fittings shall be of the recessed drainage type. This section shall not be applicable to tubular waste fittings used to convey vertical flow upstream of the trap seal liquid level of a fixture trap.
706.3 Installation of fittings.
Fittings shall be installed to guide sewage and waste in the direction of flow. Change in direction shall be made by fittings installed in accordance with Table 706.3. Change in direction by combination fittings, side inlets or increasers shall be installed in accordance with Table 706.3 based on the pattern of flow created by the fitting.
Table 706.3
Fittings for Change in Direction
Type of Fitting Pattern Change in Direction
Horizontal to vertical Vertical to horizontal Horizontal to horizontal
Sixteenth bend X X X
Eighth bend X X X
Sixth bend X X X
Quarter bend X X a X a
Short sweep X X a, b X a
Long sweep X X X
Sanitary tee X c – –
Wye X X X
Combination wye and eighthbend X X X
For SI: 1 inch = 25.4 mm.
a. The fittings shall only be permitted for a 2-inch or smaller fixture drain.
b. Three inches or larger.
c. For a limitation on double sanitary tees, see Section 706.3.
706.4 Reserved.
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-162663Fetched: 10/24/2026