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A 6 point flare wrench (11 and 14 mm IIRC) will grab those small fittings better. I won't say I've never used an open end on a flare or compression fitting, but its not as beefy as a regular hex nut so more prone to getting marred/rounded off.
Last edited by 330i SDJ; 12-28-2012 at 11:20 AM.
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