Tailgate?

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isis

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I would imagine a tailgate has drain holes designed to function when the gate is closed. It’s basically a door.
 

MRV99

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Dude that is the pressure relief regulation port. Since the truck is aluminum, gas build up due to a reaction. If that gets plugged it could cause the tailgate to swell and it will not open/close. Check your doors, you have similar relief holes at the bottom. They do not cover it under warranty if they can prove you plugged it. True story
 

FINRPTR

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I used it to open the tailgate when the electric motor stopped working. Had to make a tool to get in there to access the mechanical part of the release assembly. The tool looks like a distributor wrench. I keep it in the truck in case it ever fails again.
 
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