TITLE 77: PUBLIC HEALTH
PART 890 ILLINOIS PLUMBING CODE
CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
SECTION 890.370 PROHIBITED JOINTS AND CONNECTIONS IN DRAINAGE SYSTEMS
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Section 890.370  Prohibited Joints and Connections in Drainage Systems

 

Drainage System.  Any fitting or connection which has an enlargement, chamber, or recess with a ledge, shoulder, or reduction of pipe area that offers an obstruction to flow through the drain is prohibited. No fitting or connection that obstructs flow shall be used.  In existing buildings only a flow control valve or device may be connected to the fixture drain and shall not be considered as an obstruction.  The enlargement of a three (3) inch closet bend or stub to four (4) inches shall not be considered an obstruction.