09-07-2020, 03:15 PM
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Join Date: Jul 2004
Location: Wilton, CA.
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I've used both without issue, but I'd think the o-ring style is probably better as that's what the OEM's moved to. I'd guess the adapters are supplied for those with the older vehicles that use an inverted flare, so the box can be bolted on without having to make new lines.
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