The GPA1, GPA2 and GPA3 external gear pumps are aluminum pumps with external gears, with compensation of axial games. They allow high volumetric yields even to high operating pressure, low level of noise and are characterized by a high duration thanks to the load balancing system on driving bushings. The pumps are divided into three dimensional groups, with displacement up to 7.5, 31.7 and 61 cm3/lap respectively and with operating pressure up to 260 bar. They can be ordered as single, double or multiple pumps, with European four holes flange and conical tree 1: 8, or with SAE flange and grooved tree, with an hourly or anti -eral rotation.