G rotor pumps are internal gear pumps without the crescent. The rotor is the internal (drive) gear shown below in gray, and the idler is the external (driven) gear, shown below in orange. They are primarily suitable for clean, low pressure applications such as lubrication systems. Pressure range 0 to 10 Bar Flow – 5 to 100 LPM Application :- Automotive engines, Small Power Gen Set, Industrial Use engines.