MulticasT Twin Air. Mounting an additional metering unit under the 400L tank gives us the capability of fitting the Twin unit to 24m/32m or 36m spray booms. Having 2 metering units 2 control systems and a very high capacity hydraulic fan Avadex granules/Cover crops or grass seed can be applied at very wide widths. Dual outlets ensure there is an outlet at every 500mm to give very good coverage.