Methane and Propane Gas DetectionThe GD-2A is an all electronic detector of heating type gases (natural and bottle), designed for use alone or for connection to alarm control panels. It can operate on 12 to 24 VDC power from standby or interruptible panel power, or be powered separately. The attractive two part plastic case allows the GD-2A to be installed over a four inch square or double gang electrical box, providing a near flush mount. Six inch long pigtail leads are provided for connections to the control panel or other devices. Also known as -Macurco (Aerionics) METHANE & PROPANE GAS DETECTOR - MA-GD2A