Arb dual portable question

[Texasliam]

this threaded hole in the arb box, what is it for?

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[4x4TruckLEDs.com]

It's probably a relief valve from the box manufacturer. I don't believe ARB manufacturers the box so it's probably just left-over from whatever the boxes other uses are for.

Although the box does not seem air tight but that's just my guess.

 

[cr117]

Don't personally have one, but based on their promo video, it seems to be some sort of valve/drain plug.

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