The 690gxc was the last of the 690 series released in 2000. It is a gas mechanical ( not hydraulic ) piston pump that supports one gun usage. Basically the smallest gas unit you could buy at that time.
To sum it up, think of of 440xc with a gas motor. (the 690 uses the same packings and piston as the 440 xc)
The current version with similar output is the Titan Advantage GPX 85. This unit has a larger fluid section (pump) than the older version.
Hope this helps.
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