Normally, the gas meter valve provides the primary shut-off point on the gas service line. If this valve needs to be replaced for any reason, there is often no other convenient shut-off point upstream of the valve. The Mueller® NO-BLO® Valve Changer provides a safe, effective and easy to use means for stopping gas flow upstream of the meter valve allowing the valve to be replaced. It also allows the MIP threads on the riser to be refurbished, if necessary.