The AccuAir Gang Valve is a true air control valve. This modern gang valve has large yellow easy to turn knobs that make adjusting the airflow easy and accurate. The AccuAir Gang Valve uses a needle valve, which allows the air to be adjusted in small increments to control the exact amount of air flow desired. Another unique feature of the AccuAir Gang Valve is the hanger attachment, which enables the valve to be mounted securely on any size tank.