Abstract: Apparatus for transporting flowable particulate material including a container for receiving the material and having a material receiving chamber and a material inlet, and a gas inlet chamber with a gas inlet, the two chambers being separated by a porous wall, a material outlet, a pressure sensor in the material receiving chamber and a valve operated by the sensor when a predetermined pressure occurs in the material receiving chamber for opening said material outlet, the material outlet including a conduit between the material receiving chamber and a location external to the container, one end portion of the conduit being movable relative to another portion thereof to provide a predetermined spaced relationship between the end portion of the conduit and the porous wall, the gas inlet chamber being separated into two parts by a gas inlet compartment depending within the chamber from the porous wall and two manually adjustable control valves for controlling the supply of gas to the chamber and compartment respe