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Old 06-05-2016, 09:00 PM   #1
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Extending gas line


I am redoing part of my NG lines (rigid pipe) to add a branch for a range. This will require disassembling the two branches that exist to increase the size of a tee, and adding a 2nd tee for a new vertical drop of 3/4" pipe. No problem so far.

There is one final horizontal run of 5ft needed to reach the back of the new oven. I can drill the studs, but there is no way to get a rigid pipe in there. Can I just use a 6ft flexible gas line for this, or is there an issue with having a rigid/flex connection inside the wall?
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Old 06-05-2016, 09:58 PM   #2
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Re: Extending gas line


Appliance flex connectors cannot be concealed in a wall- not code compliant
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Old 06-05-2016, 10:02 PM   #3
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Re: Extending gas line


run in corner build soffit
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Old 06-05-2016, 11:14 PM   #4
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Re: Extending gas line


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Originally Posted by TheEplumber View Post
Appliance flex connectors cannot be concealed in a wall- not code compliant
So what about these two options:

1) The run is entirely behind cabinets, so the flex could be in the back of the cabinet space instead of in the wall?

2) Instead of CSSB (appliance flex connector), how about CSST which is clearly meant to replace rigid pipes in walls? I could just get a length of that and add connectors.
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Old 06-06-2016, 07:37 AM   #5
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Re: Extending gas line


Although the tube may be same but the connectors are different and there are rules about how the yellow tube can be installed. Im thinking of doing this diy (but the town may not let me diy) and will need at least the tool that crimps (?) the permanent connections. I also need to find out if the permanent connections are sold to anybody.
Can you come through the floor than a wall?
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Old 06-06-2016, 10:53 AM   #6
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Re: Extending gas line


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Originally Posted by carpdad View Post
Although the tube may be same but the connectors are different and there are rules about how the yellow tube can be installed. Im thinking of doing this diy (but the town may not let me diy) and will need at least the tool that crimps (?) the permanent connections. I also need to find out if the permanent connections are sold to anybody.
Can you come through the floor than a wall?
Several supply shops will sell the CSST cut to length, so maybe those same shops will add the connectors for a fee. My install has gas lines in the attic. A wall opening behind the stove prevents a direct vertical run - thus the horizontal run.
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Old 06-07-2016, 10:59 AM   #7
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Re: Extending gas line


I was just at my local HD, and they carry a DIY brand of CSST along with the proper connectors. All you need is a tubing cutter for CSST. The associated fire safety risk and extra bonding (grounding) requirement has me leaning towards a rigid pipe solution.
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Old 06-08-2016, 07:48 PM   #8
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Re: Extending gas line


Why not just notch the joist and use black steel gas pipe? Not like your going to put a nail through that.
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Old 06-09-2016, 10:38 AM   #9
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Re: Extending gas line


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Why not just notch the joist and use black steel gas pipe? Not like your going to put a nail through that.
Hadn't thought of that, and it is the best solution. With this being behind cabinets, and my plaster about 1" thick, I won't need to notch much to make it flush with the wall. I could even add a recessed shutoff box.
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