Mine I had to make up a tool to push on both sides for the threads to even engage to pull them tight. Then I tried to bottom one out and it cracked. None of mine actually bottomed out but I snugged them tight and they are holding pressure. Fingers crossed. I was on aeroquips sight and they have a torq spec for there fittings so I'm not sure if the ptfe fittings actually do bottom out

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I will go with a different brand next time and put straight ends then the 90s on so they can swivel better