Abstract: Apparatus for controlling gas flow is provided and includes a block having a plurality of distribution channels, and an inlet receiving gas from a source, a plurality of solenoid valves each communicating with the inlet and one of the flow control meters, a plurality of flow control meters each communicating with one of the channels. An opening is formed through the block and is in communication with and transverse to the distribution channels. A spool may be received within the transverse opening to group the channels to provide discrete stepped control of the flow to the outlet. The apparatus is contained in a compact control panel housing which may be mounted adjacent the gassing operation.