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Best bet is to use two flare wrenches if possible. I have never had an issue with one of those. Be very cautious not to turn the right side. It should not spin on the blue line. Just hold the right and position your other 15 mm wrench so that when you squeeze them together it loosens the left side. You will be able to get the most leverage by squeezing the two wrenches together. Watch your fingers!!
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