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the instructions will tell you how to flush the system with solvent (usually water or mineral spirits, depending on the paint you'll be using) and how to pump the paint through the hose to the spray gun.
il manuale di istruzioni vi dirà come spruzzare la vernice attraverso il tubo alla pistola a spruzzo, e pulire la macchina (in genere acqua o solvente con ragia minerale, a seconda della vernice on userete).