My city codes require that a licensed plumber do such work. If you
DIY, be sure to use the proper pipe and fittings. NG and propane
are not the same animal and require different materials.
I had a plumber install the NG piping, the shut-off valve, and the
fitting for the hose. In my case, he connected to the NG line
serving the furnace and water heater. I have the oxygen bottle
secured upright under my bench so the two hoses are close together.
Works well. I do prefer NG & Oxygen for it's cleanliness and the
ease of leaving the NG flame burning and just turning the oxygen off
Judy in Kansas where real August temps are expected today....