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Hatz E780


Hi I just bought two Hatz engines coupled to diaphragm pumps manufactured by a Dutch company called ZW Pompen, my question is does anyone have an internet location where I can download any info or manuals on the E780 & ES780 (I have one of each but externally they look the same.....
Also if anyone has any info at all on these 4" pumps I would be very greatful.