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A shutoff valve shall be placed at the immediate connection of each central supply system to the piped distribution system to allow the entire central supply system, including all accessory devices (e.g., air dryers, final line regulators), to be isolated from the facility. [NFPA 99:]
1314.6.1 Location
The source valve shall be located in the immediate vicinity of the central supply system. [NFPA 99:]
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