Trying to figure out if this is shielded flexible gas line. My HVAC guy has never seen it and told me to call it out. I asked him if it needed to be bonded. It’s hard to read. Here’s some pics. Shady work.
Looks like FlashShield® and FlashShield + ™ flexible gas piping. Maybe purchased from a distributor across the border in Mexico.
As for bonding. Direct bonding is required for all piping systems incorporating CSST.
Your HVAC guy. It’s hard to read if he’s a real HVAC guy. No joke.
The CSST flex tubing is directly terminating to the NG piping. 
I would say it is bonded unless the piping does not go into the soil below grade.
Is there a manifold in the basement or utility room for other gas powered equipment? That requires bonding.
Corroded reducer fitting is all I can see wrong but I am not there.
Lets see what others have to say…
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lol he’s a real HVAC guy. 20 years. Here’s a pic after it enters the house. The yellow is for the gas range upstairs. The flash shield goes to the furnace.
Habit and repetition have a way of boxing tradesmen in.
I look at it this way. Equipment requires bonding. Any tubing is automatically bonded WHEN the equipment is bonded.
As for NG piping. NG metal piping is grounded/bonded by the fact that metal piping enters the ground. I would consider, for the sake of argument, any additional equipment bonding to terminate as required by electrical service bonding to the main water supply line.
As for a NG manifold. Pic below.
Report Limitations: Wall, Ceiling and Flooring assemblies. Storage. ETC.
Let’s hear what other have to say.
Best of luck with all your endeavors.
Pipes should be bonded because when they are metal they could potentially become energized and therefore need path to ground. I think the bonding requirement is more applicable for hard piping (metal) than to flex lines.
You need to do some research and CE’s!
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Did you figure out where a fireplace shutoff can be located? 
Do I? Why?
I would call out the CSST should be bonded at the first brass fitting off the meter.
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He’s correct that you do. As I suspect we all do lol. And one should never give advice if it starts with “I think”. And csst does need to be bonded.
Ryan Hesselberg
Owner
Hess Home Inspection
608-385-2795
www.Hesshi.com
That’s a start, although some csst like flash shield can use equipment as bonding.
Ryan Hesselberg
Owner
Hess Home Inspection
608-385-2795
www.Hesshi.com
lol, you should read the whole article that he sent … I think
When I started to install CSST in the 90’s no bonding was required 
Lol I think you’re right. And I know it confirms exactly what I said
Ryan Hesselberg
Owner
Hess Home Inspection
608-385-2795
www.Hesshi.com
Not all brands of CSST require external bonding. Like black gas pipe the bonding is accomplished by the connection to an equipment grounding conductor run with the branch circuit feeding an appliance.
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And some AHJ’s don’t give a rats arse about brands. They want it all bonded the same, IF at all!
I can see that happening.
Eliminates the “Which Standard” BS! Ya know contractors, Always gotta bitch about someting’!!
CSST bonding methods per manufacturer. Typically, the manufacturer’s recommendations take precedence depending on whether the AHJ would like to get sued or would rather the manufacturer get sued.
…as the MINIMUM Standard, but many AHJ’s use the option to enhance their Local Requirements to suit their needs.