Fitting Leak
A leak at a fitting (tee, elbow, or coupling) is usually caused by a bad glue joint, a cracked fitting, or a threaded connection that wasn't sealed properly.
Symptoms
- Water dripping or spraying from a pipe joint
- Leak only happens when the associated zone runs (lateral) or is always active (main line)
Diagnosis
Either the PVC cement joint failed (cold joint, not enough primer), the fitting cracked, or a threaded connection has no or worn Teflon tape.
Step-by-Step Repair
- 1
Shut off the water. Expose the fitting by digging around it.
- 2
If it's a threaded connection: unscrew it, clean the threads, apply new Teflon tape (3-5 wraps clockwise), and retighten.
- 3
If it's a glued fitting that failed: you cannot re-glue it. Cut the fitting out with a saw.
- 4
Install a new fitting with short pipe stubs and couplings. Prime and cement all joints.
- 5
Let the cement cure, restore water, and check for leaks.
Parts Needed
- •PVC Tee × 1 — Match the fitting type that failed
- •PVC Coupling × 2
- •PVC Primer & Cement × 1
Pro Tips
- A "cold joint" (glue didn't bond) is the most common cause of fitting leaks. Always prime both surfaces and apply cement generously.
Prevention Tips
- Never glue wet fittings — dry them first, even in the field.
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