Apprentice answerCan over-tightening round companion rings cause leaks
3rd YearRound, Spiral & Flat Oval DuctStandard Correction
Yes. Over-torque can warp the ring and damage the gasket. Reset the joint with a fresh gasket and even tightening by manufacturer direction.
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Plain-English answer
Big round companion rings need even compression. A breaker bar can stretch holes, warp the angle ring, and cut the gasket instead of sealing it.
Disassemble the bad joint, replace damaged gasket, dress/replace warped rings as needed, then tighten evenly in a cross-pattern to the approved torque or manufacturer instruction.