Tighten nut to stop hydraulic line leaks?

Main Hydraulic line leaks. Which way to turn the smaller nut to tighten?

I can't see how the internal mechanism works inside the big 2" hydraulic line to tighten down to keep the line from leaking. Do I turn the smaller "nut" the same as the main nut to tighten or the opposite direction?
Thanks, Ron

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