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Common Causes of Fitting Sealing Failure
Leakage may be caused by tubing mismatch, installation method, cutting quality, sealing component condition or system pressure, not only by the fitting itself.

Typical causes of leakage
Common causes include tubing size mismatch, uneven cutting, insufficient insertion depth, loose threads, damaged seals, material incompatibility and system pressure beyond the applicable range.
Recommended troubleshooting steps
Check tubing and fitting specifications first, then inspect the tubing end, seal condition and connection alignment. If corrosive reagents or cleaning solutions are used, long-term material compatibility should also be confirmed.