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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.
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.