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Is there a general rule for tightening braided supply lines? I’m afraid of under tightening but also afraid of over tightening. I usually hand tighten them as much as possible and then go 1/4 turn with the wrench. Is that the correct way to do it? Do I want the least amount of tightening that produces no leaks? If I do have a leak, should I tighten until it stops, or is it better to turn off the water go another 1/4 turn, turn on the water and check again, etc. Sorry for the stupid question, but I just want to understand how the pros do it.
 

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There is a rubber washer inside, so tightening too much can rip the washer. I hand tighten then add another quarter to half turn with a wrench.
 

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Imo, the procedure you describe is sound.
And there's no need to keep turning the water on and off. Just tighten a bit more until the leak stops. If it's an old supply line with a worn out or brittle washer, it may never stop leaking (but it's unlikely to gush, which is why you can keep the water on). If you've gotten it nice and tight and it still drips, just replace the washer. Or the whole line (they're cheap).
 

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There is no rule. If it drips tighten it till it stops. Just make sure everything is lined up correctly and you have not cross threaded anything.
 
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