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<br />per foot, except as provided in section ll06(a}.' <br /> <br />"Section 24.23 <br /> <br />Section 310 of the Plumbing Code is <br /> <br />amended to read as follows: <br /> <br />"'Section 310 <br /> <br />(a) 'No double hub fitting, single <br /> <br />or double tee branch, single 'or double tapped tee branch, <br /> <br />side inlet quarter bend, running thread, band or saddle <br /> <br />, <br />. c <br /> <br />shall be used as a drainage fitting, except that a <br /> <br />double hub sanitary tapped tee may be used on a vertical <br /> <br />line as a fixture connection. <br /> <br />" U (b) No drainage or vent piping' shall be drilled <br /> <br />and tapped for the purpose of making connections there- <br /> <br />to, and no cast iron soil pipe shall be threaded. <br /> <br />"U (c) No waste connection shall be made to a <br /> <br />closet bend or stub of a water closet Or similar fixture. <br /> <br />tt U (d) Except as hereinafter provided in sections <br /> <br />614 and 616 and by Appendix E, no vent pipe shall be <br /> <br />used as a soil or waste pipe. <br /> <br />It' (e) No fitting, connection, device or method <br /> <br />of installation which obstructs or retards the flow <br /> <br />of water, wastes, sewage or air in the drainage or <br /> <br />venting systems in an amount greater than the normal <br /> <br />frictional resistance to flow, shall be used unless it <br /> <br />is indicated as acceptable in this Code or is approved <br /> <br />by the Administrative Authority as having a desirable <br />and acceptable function and as of ultimate benefit to <br /> <br />the proper and continuing functioning of the plumbing <br /> <br />system. The enlargement of a three inch closet bend <br />or stub for four inches shall not be considered an <br /> <br />obstruction. <br /> <br />It' (f) Except for necessary valves, where inter- <br /> <br />-9- <br /> <br />. <br />