fire pit

I am trying to install a natural gas fire pit in my flagstone patio. I am trying to make the pit flush with the surface of the flagstone (nothing above ground). I have conduit running to the location and a hole dug, but I'm unsure how to configure the gas lines and valve.
Specifically, all the outdoor fire pits I've seen are above ground, which makes it easy to access the manual gas valve with a key on the side of the above-ground portion, below where the ring burner is.
Where I'm doing a flush mount pit, is there a standard solution? I was thinking about something equivalent to a sprinkler box to access the valve in a location adjacent to the fire pit (although the sprinkler box wouldn't look too good in the patio).
Can anybody steer me in the right direction to get this setup?
Also, which gas line should I pull through the conduit? The yellow flex stuff or the flex stainless (or other)?
THANKS!
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There is a gas piping code. Check that to see where the valve can be located. It has to be within a certain distance of the appliance.
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Are there wooden railings near the fire pit? Have you made sure you have a clear area around the pit? Is your fire insurance up to date? You might want to check those instructions!
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I understand the concern from those of you who feel the pit shouldn't be on a deck but there are a few factors involved.
1. It will never be left unattended 2. It's on the corner of the deck where there are no rails and it's open on all sides. Two sides are grass area and the other two is the deck. 3. It's within 8 feet of my garden hose which I have on while the pit is lit.
Therefore, my only concern is burning the deck from underneath due to the heat. I've setled on an idea brought about by some of your suggestions, which I appreaciated. I beleive as I remain alert to the surroundings, it'll be fine.
Thanks for the help
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wrote:

All it takes is one (ONE) ember to fall between the boards of the deck. You would be amazed at how much combustible material is included in the dirt below. A few hours after you think the fire is out, and leave for dinner at your favorite restaurant, That ember will finally manage to assert itself. When you come home, you'll be greeted by the fire department, and told to wait across the street.
It's a REALLY stupid plan.
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