What is very important is for professional use the functions of wet and dry operation are not mixed otherwise the result can be a container full of almost MUD which becomes difficult to empty and will be detrimental to performance. The change from dry to wet is designed to be simple, exchange a dry filter for wet safety float valve and a change of floor nozzle, or vice versa. The accessory kit provides tools for both wet and dry operation with aluminium tube set as standard.