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715.4 Diameter.
Backwater valves, when fully opened, shall have a capacity not less than that of the pipes in which they are installed.
715.5 Accessibility.
Backwater valves shall be installed so that access is provided to the working parts for service and repair. Masonry access manholes shall be provided when the centerline of any drain line is 18 inches (457 mm) or more below a slab on grade.
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