NAC445A.67255. Cross-connections and backflow: Restrictions on use of certain valves and piping assemblies.

Latest version.

     1. A stop and waste valve must not be used on a service line.

     2. If a valve or piping assembly, including a frost-free riser, has an opening that is subject to flooding, the valve or piping assembly must not be used on a service line unless:

     (a) The valve or piping assembly is adequately protected by an assembly for the prevention of backflow; and

     (b) If the piping assembly is a frost-free riser, the riser is equipped with appropriate valves and a connection for the introduction of compressed air, pursuant to which water may be purged and the system prepared for winter.

(Added to NAC by Bd. of Health, eff. 2-20-97)

                    
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