GV-20 Little Firefighter Earthquake Valve Stabilizer Bracket Firefighter Gas Safety Products gas valve stabilizer is recommended for use with all of our gas shut off valves. Easy to install and vital to the proper functioning of the valve itself. The first pre-fabricated stabilizer approved by LA City can be used with all shut-off valvesStabilize both horizontal and vertical installations and piping.GV-20 used on gas piping systems up to 1 1/2" to 2"