PASSTECH ➜ BERTOLI INTERPUMP Group S.p.A – Official Philippine–Partner. High pressure homogenizers and plunger pumps since 1974. For over 40 years technological leader in the field of homogenizers and Plunger pumps. All the best technology ever tailor-made for you. Interpump Group is the largest manufacturer in the world of high and very high pressure piston pumps and one of the world leaders in the hydraulic sector. The interpump group is a company of men and technicians that is fully positioned and with pride among the major world players in the reference sectors.