In this area there are many old homes that were once iluminated with gas lamps. Many of the homes still have the gas piping running to the fixture locations which are now electrified. Trying to replace an old fixture is usually a mess. Most of these old gas systems are disconnected and can be removed if neccesary, but not all! I have removed the nipple that comes into the old pancake box only to be blasted by gas. Quite a scary situation trying to screw the thing back in while the gas is blowing in your face. Anyone else run into this?