Re: Propane fireplace insert
Go to any hardware or appliance store, they have gas rated flexable lines for gas appliances.
You need a cut off, most places withe building codes require one within so many feet of the fire place, check your building dept.
Check your building code, here we use bendable copper for propane lines but other places require black pipe.
Running the electric in the same path I would put the electric in a plastic conduit.
Be sure you live your life, because you are a long time dead.-Scottish Proverb