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310.1 Fittings
No double hub fitting, single or double tee branch, single or double tapped tee branch, side inlet quarter bend, running thread, band, or saddle shall be used as a drainage fitting, except that a double hub sanitary tapped tee shall be permitted to be used on a vertical line as a fixture connection.
310.2 Drainage and Vent Piping
No drainage or vent piping shall be drilled and tapped for the purpose of making connections thereto, and no cast-iron soil pipe shall be threaded.
310.3 Waste Connection
No waste connection shall be made to a closet bend or stub of a water closet or similar fixture.
310.4 Use of Vent and Waste Pipes
Except as hereinafter provided in Section 908.0 through Section 911.0, no vent pipe shall be used as a soil or waste pipe, nor shall a soil or waste pipe be used as a vent. Also, single-stack drainage and venting systems with unvented branch lines are prohibited.
310.5 Obstruction of Flow
No fitting, fixture and piping connection, appliance, device, or method of installation that obstructs or retards the flow of water, wastes, sewage, or air in the drainage or venting systems, in an amount exceeding the normal frictional resistance to flow, shall be used unless it is indicated as acceptable in this code or is approved in accordance with Section 301.2 of this code. The enlargement of a 3 inch (80 mm) closet bend or stub to 4 inches (100 mm) shall not be considered an obstruction.
310.6 Dissimilar Metals
Except for necessary valves, where intermembering or mixing of dissimilar metals occurs, the point of connection shall be confined to exposed or accessible locations.
310.7 Direction of Flow
Valves, pipes, and fittings shall be installed in correct relationship to the direction of flow.
310.8 Screwed Fittings
Screwed fittings shall be ABS, cast-iron, copper, copper alloy, malleable iron, PVC, steel, or other approved materials. Threads shall be tapped out of solid metal or molded in solid ABS or PVC.

Related Code Sections

310.0 General Regulations, Prohibited Fittings and Practices
No double hub fitting, single or double tee branch, single or double tapped tee branch, side inlet quarter bend, running thread, band, or saddle ...
310.5 General Regulations, Obstruction of Flow
No fitting, fixture and piping connection, appliance, device, or method of installation that obstructs or retards the flow of water, wastes, sewage ...
310.6 General Regulations, Dissimilar Metals
Except for necessary valves, where intermembering or mixing of dissimilar metals occurs, the point of connection shall be confined to exposed ...
310.7 General Regulations, Direction of Flow
Valves, pipes, and fittings shall be installed in correct relationship to the direction of flow ...
405.0 Plumbing Fixtures and Fixture Fittings, Prohibited Fixtures
Water closets having an invisible seal or an unventilated space or having walls which are not thoroughly washed at each discharge shall be prohibited ...