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-13- <br />with or without other fixtures and leading towards and connect- <br />ing with the main soil pipe, but not necessarily extending <br />through the roof. <br />The term "waste pipe" is applied to any pipe receiving <br />the discharge from anyfixture or fixtures other than water <br />closets. <br />The term "house drain" is applied to the pipe within <br />any building buried in the ground or below the basement <br />floor which receives the total discharge from any fixture <br />or set of fixtures, and may or may not include rainwater <br />leader which conducts or carries same to the house sewer. <br />The term "House sewer" is applied to the extra heavy <br />cast iron sewer, which shall not be less than five inches <br />internal diameter, and which begins outside of the wall of <br />a building and connects the house drain with the public <br />sewer in the street. <br />The terra "main vent" is applied to the vertical line of <br />air pipe running through two or more floors to which the <br />vent or revent pipes from the various floors are connected. <br />The term "vent pipe" is applied to any pipe provided <br />to ventilate a system of piping, and to which the revents <br />are connected. <br />The term " revent pipe" is applied to any pipe used to <br />prevent siphonage and back pressure. <br />The term "soil vent" or "waste vent" is applied to that <br />part of the main soil pipe or waste pipe which is above the <br />highest installed fixture waste connection and extends through <br />the roof. <br />When sizes of pipes are specified the internal diameter <br />of the pipes are meant. <br />Section XLIII. General requirements. All material used <br />in the installation of any plumbing and drainage system,or <br />