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Potable water inlets to gravity tanks shall be controlled by a fill valve or other automatic supply valve installed so as to prevent the tank from overflowing. The inlet shall be terminated so as to provide an air gap not less than 4 inches (102 mm) above the overflow.

Related Code Sections

1301.9.4 Nonpotable Water Systems, Makeup Water
water supply line to the storage tank shall be provided. Inlets to the storage tank shall be controlled by fill valves or other automatic supply ...
1301.9.5 Nonpotable Water Systems, Makeup Water
water supply line to the storage tank shall be provided. Inlets to the storage tank shall be controlled by fill valves or other automatic supply ...