All washing tunnels are built in stainless steel AISI 3016 th. 20/10 TIG electro-welded. The tunnels can be with continuous or step-by step advancement depending on the specific needs. On the top and on the bottom of the treatment sections are placed the spraying ramps with nozzles. The spraying ramps are adjustable and with quick connections and fixings to facilitate their periodic cleaning and maintenance. The bottom of the treatment sections is connected with the buffer tanks. To ensure an excellent cleaning, the washing buffer tank has two sections. The first section is used to filter the solution up to 500 microns and remove contaminants in suspension, the second section is used to spray the detergent, with a low degree of contamination. Tunnels can be of a variety of measures and can be customized to specific requests.