Dynamic gear pump models GP-F10, GP-F20 and GP-F25 are available with features that allow the pumps to be stacked to produce double and triple pumps from the base model. Technical data, including displacement sizes, working pressures, rated speeds, etc. is as per the pump in the first position of the stacked pump. For example, model GP-F20D-12/08-S9-C is a double pump with displacements of 12 and 8 cm³, rated at 2000 rpm and 2900 psi with a 9-tooth spline drive shaft and clockwise rotation.