When shutting off gas, should I shut the valve before the regulator, or the valve that goes after the regulator?

Hi there, I am learning how to turn off the natural gas of a house in case of an emergency or for maintenance. The line that goes into the furnace room from the outside goes like this: exterior gas tube into a “Shut off before valve”, then to a Regulator, then to a “Shut off after valve”, then splits to three locations the stove, fireplace, and furnace.

So whenever I need to shut off the gas from the inside of the house, should I shut the valve that goes before the regulator (Shut off before valve), or should I shut the valve that goes after the regulator (Shut off after valve)?

Thanks!

submitted by /u/MarsInvador
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Hi there, I am learning how to turn off the natural gas of a house in case of an emergency or for maintenance. The line that goes into the furnace room from the outside goes like this: exterior gas tube into a “Shut off before valve”, then to a Regulator, then to a “Shut off after valve”, then splits to three locations the stove, fireplace, and furnace. So whenever I need to shut off the gas from the inside of the house, should I shut the valve that goes before the regulator (Shut off before valve), or should I shut the valve that goes after the regulator (Shut off after valve)? Thanks! submitted by /u/MarsInvador [link] [comments]

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