In every case where a plumbing outlet or plumbing fixture is installed or located below the elevation of the curb or property line, an approved type of backwater trap or an approved type of back-water sewer valve shall be installed between the outlet and the public sewer in such a manner as to prevent sewage from flowing back or backing up into any such outlet or plumbing fixture. Every such trap or valve shall be installed in the basement in a box, or manhole of concrete, cast iron or other material approved by the Building Inspector so that it will be readily accessible at all times. The trap or valve shall be placed only in the drain line serving the fixtures that are located below the elevation of the above mentioned curb or property line and no drainage from fixtures located above this elevation shall pass through such trap or valve.
('86 Code, § 16.12.140) (Ord. 2472, passed 9-18-51) Penalty, see § 1.12.010