Abstract: A system and method for the transport of fly ash and other particulate matter. The system comprises (a) a fly ash hopper; (b) a metering container for measuring the amount of fly ash to be transported; (c) a first valve for regulating the movement of fly ash between the hopper and the metering container; (d) a transport line for transporting fly ash out of the metering container; (e) a second valve for regulating the movement of fly ash between the metering container and the transport line; (f) a third valve for regulating venting and pressurization of the metering container; and (g) means for moving the plug between first and second positions, the movement means being in physical communication with the third valve. The third valve comprises (i) a valve body having a bore and five ports in communication with the bore; (ii) a valve plug movably mounted in the bore between the first and second positions; and (iii) sealing means for preventing fluid passage out of the bore other than through the ports.