Aluminium hopper 1.7 metres diameter with 2.1 metre vertical wall and 1.3 metre deep cone terminating in a 200 mm diameter flanged outlet. The hopper top is enclosed and has a tangential blowline entry pipe and a DCE model UMA 150V dust filter on top with a shaker motor but no fan. The filter adds 1.0 metre to the height. There is a side access hatch and motorised high and low level switches. Working volume is about 5.65 M3.