used cyclonic suction tank for dust, it is a Coral system for purifying dust and fumes with backwash cleaning for the treatment of environments with dust. unfortunately the filters and the motorized part are missing but the company is open and can provide information on this. initially the tank was composed only of the blue parts but they increased the capacity by adding the stainless steel extension, it has never been used. dimensions: blue base 160X145cm h232cm, inlet hole Ø30cm, stainless steel extension h149cm, lid 130X130cm h70cm, outlet hole Ø30cm, int. pipes length min 91cm, max 131cm