I am installing a gas stove. The gas supply is directly below the floor where the stove will be and has a T and Shut-off already in place. Can I run a 48" CSST line from the stove, through a hole in the floor and connect it up directly to the existing valve?
Or must I extend a black pipe extension through the floor first, add a valve and then
Connect the CSST line to the stove.

Hi Allen.

You want to extend the shutoff to above the floor and install a 3 ft flexible connector (your state may allow a 4 footer).

No pipe dope on the face of the flare fittings or threads where the flare nut meets the flare fittings...pipe dope goes on the pipe threads of the flare fitting , but not on the threads of the flare fittings/face. Pipe dope goes on all pipe threads (read instructions on the flexible connector).

Test all connections/fittings with a strong soap solution.

Be sure to install the ANTI.-TIP device included with the stove. Do NOT skip this required step... it has saved many lives over the years.

Finally, check to see if a gas permit is required in your state (it is required in all states I know of). If a gas permit is required you may want to let a plumber do this job. Insurance companies will deny any claims that arise as a result of an un-permitted gas appliance.

Good luck!

Mark

Code requires an easily accessible valve. Unfortunately for many people this means BEHIND the stove at floor level. Great unless you have a fire and try to get access to shut off the gas. Our son just did a kitchen cab remake and we installed the shutoff in the cabinet immediately next to the stove and connected a 36" CSST line there. In the last house I built, I installed 2 valves. One is behind the stove and the other is directly under the stove in the basement. Remember, these are really maintenance valves, not emergency shut off valves. If you have a fire, get out, call 911 and shut off the gas at the meter.

Gas Flex cannot be installed under floor - at least in my area of operation. I suggest you extend rigid pipe above the floor, valve on top of it - then flex to the appliance

Milo