Use Jameson Live Tracer™ Traceable Rodder with an electrofusion insertion tee to locate live gas mains with no blow by.Connect a transmitter to the Live Tracer™ to energize the unit with a specific frequency. When the energized rod is pushed into the pipe, the signal radiates out to the surface where a receiver detects the frequency.The entire buried pipe can be traced and marked continuously from above ground by one man without digging.