In the field of printing machines with UV and water based inks, the peristaltic pump allows an easy management of the phases of the ink supply. The adjustability of the flow rate, the possibility of pumping also inks with solids pigments, the low speed handling of the peristaltic pump make it the ideal solution for this application. An additional advantage is that the peristaltic pump, working in both directions, can also be used for emptying the system, making the scheduled maintenance easier and cheaper.