NG22 Main Stage. D Spool External Pilot Supply. External Drain
4WH22E7X/6E/VS
NG22 Main Stage. E Spool External Pilot Supply. External Drain
4WH25G7X/6E/VS
NG22 Main Stage. G Spool External Pilot Supply. External Drain
4WH22H7X/6E/VS
NG22 Main Stage. H Spool External Pilot Supply. External Drain
4WH22J7X/6E/VS
NG22 Main Stage. J Spool External Pilot Supply. External Drain