When a PVC joint leaks, depressurize the line and attach a vacuum source to an opening as close to the leak as possible. Turn the vacuum on to suck air in through the leak with all other openings plugged. Take a little PVC cleaner and let the vacuum suck some into the leak. Then let the vacuum run for a minute to dry the cleaner. Then, suck a little PVC cement into the leak. Turn off the vacuum to let the plug cure for a few minutes and test the system for leakage.

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