You might get lucky, but I understand a box end wrench or ring spanner derives its strength (and hence the material thickness in the ring) from the complete circle which confines the nut.
A line wrench or flare nut wrench makes up for the loss of the ring's strength in one way by adding bulk to the business end. Also, the alloy strength is a big factor, so that bulk can be kept at a minimum.
From what I read here, experienced folks are discriminating about the manufacturer of their line wrenches. For the brake lines, the 11mm line wrench from Snap-On is touted as well worth the premium cost. The consequences of a mangled flare nut are never cheap.
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Art Benstein near Baltimore
"You're only middle age for one day. I just don't know what day that was."
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