§ 156.41  USE OF CURVE PIPES.
   Curve pipes shall be used for every deflection from a straight line or more than one and one-half inches in one foot. Branch soil and waste pipes shall join each other, and on the main drain with a fitting of suitable curve, never at right angles except when discharging into a vertical pipe in such a position that it is impracticable to do otherwise.
(1967 Code, § 16-12)  Penalty, see § 10.99