// CODE SNIPPET
409.1.4 Main Shutoff Valve
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Piping systems shall be provided with an approved main shutoff valve before the first branch line. The main shutoff valve shall be installed in the first available location inside the building that provides ready access and shall have a permanently attached handle.
Exception: Gas piping that serves an appliance on the roof of a building shall install the shutoff valve on the roof, ten feet or more from the roof's edge, before the first branch line.
Main shutoff valves controlling several gas piping systems shall be protected from physical damage and shall be placed an adequate distance from each other so they will be easy to operate.