NG16 Main Stage. D Spool External Pilot Supply. External Drain
4WH16E7X/6E/VS
NG16 Main Stage. E Spool External Pilot Supply. External Drain
4WH16G7X/6E/VS
NG16 Main Stage. G Spool External Pilot Supply. External Drain
4WH16H7X/6E/VS
NG16 Main Stage. H Spool External Pilot Supply. External Drain
4WH16J7X/6E/VS
NG16 Main Stage. J Spool External Pilot Supply. External Drain