Every service pipe shall be laid with sufficient slack to allow not less than one foot (1') of extra length and in such manner as to prevent rupture by settlement. The service pipe shall be placed not less than seven feet (7') below the final surface grade and be so arranged as to prevent rupture by freezing. A shutoff or other stop cock with waste valve of the size and strength required shall be placed close to the inside wall of the building and be well protected from freezing. Copper tubing shall be used for all services of two inches (2") or less. Joints on copper tubing shall be as few as possible, and not more than one joint shall be used for a service up to seventy feet (70') in length. Each joint shall be left uncovered until inspected by the city. Every service over two inches (2") shall be cast iron or polyvinyl chloride (PVC). Connections with the mains for domestic supply shall be at least three-fourths inch (3/4"). (Ord. 106, 5-12-1981)