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XXL Refilter line is related to the project of replacing internal filters of catalysts, offering a valid and cheap alternative to total replacement through a new catalyst. This  advantageous line allows to save over 50% on the cost, offering at the same time quick service, superior quality and better results than the ones obtained by using the traditional methods of filters-cleaning. This ideal – above all a “green” mission – was born with the aim of creating premium quality models of Euro4 / 5 catalysts able to retain soot and particulate contained in exhaust gases of railway engines through the filters.