A:Answer This range might only require 1/2" but that's 100% assuming you have enough pressure at the point where the short 1/2" flex hose connects from your wall (line) to the range. This doesn't mean that your entire line can be 1/2". The longer the line is from your gas meter outside, the more pressure it takes to get the gas to your range. For illustration purposes if you were running a gas line 25-miles, a 1/2" pipe would _obviously_ not be enough - as it loses pressure along the way. If your outside gas meter is like 5-10 feet from where your range will be, then a 1/2" line the entire route would be plenty. But if you're running a line from the other side of your house 150' away going up into the attic then back down, you could be talking 200' of line before you get to that 1/2" connector for the range's flex-hose. In this case you'd be better off running a 3/4" pipe/line for that long distance, then step it down to a 1/2" connector right at the end with a 3/4-1/2" reducer.
