Installation of fittings.
Municipal Code of Chicago § 18-29-706.3
in effect18-29-706.3 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 18-29-706.3. Change in direction by combination fittings, side inlets or increasers shall be installed in accordance with Table 18-29-706.3 based on the pattern of flow created by the fitting. Double sanitary tee patterns shall not receive the discharge of back-to-back water closets and fixtures or appliances with pumping action discharge.
Table 18-29-706.3
Fittings for Change in Direction
Type of Fitting Pattern | Change in Direction
Horizontal to vertical | Vertical to horizontal | Horizontal to horizontal
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 eight bend | 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 and larger.
c. For a limitation on double sanitary tees, see Section 706.3.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692103Fetched: 10/24/2026