How to Fix a Leaking Pipe Joint
Last updated: 30 September 2026
Turn off the water, dry the joint, tighten the compression fitting, or replace the olive and seal.
Overview
A leaking pipe joint can cause water damage and increase your water bill. This guide covers fixing a leaking joint on copper and plastic pipes.
Step-by-Step Fix
Before beginning any repair, ensure you have isolated power or water supplies. Clear your workspace, gather standard hand tools, and wear appropriate personal protective equipment (PPE).
- Turn off the water supply to the leaking pipe at the nearest isolation valve. If there is no isolation valve turn off the main stopcock. Open a tap to release any residual water and confirm the supply is off before starting work. Place a bucket under the joint to catch drips.
- Dry the joint thoroughly with a cloth. Identify the type of joint. Compression joints have a nut at each end. Soldered joints are smooth. Push fit joints have a plastic collar. The repair method depends on the joint type.
- For compression joints, use an adjustable spanner to tighten the compression nut a quarter turn clockwise. Hold the pipe steady with a second spanner to prevent twisting. If the leak persists the olive inside the joint may need replacing.
- To replace the olive turn off the water and drain the pipe. Undo the compression nut and pull the pipe out of the fitting. Remove the old olive with a small hacksaw or olive puller. Fit a new olive and re-tighten the nut. Apply PTFE tape to the threads if needed.
- For push fit joints check that the pipe is fully inserted into the fitting. Push the pipe in firmly until it stops. If the joint still leaks the O-ring inside the fitting may be damaged. Remove the pipe and inspect the O-ring. Replace the fitting if the O-ring is damaged.
- For soldered joints the joint must be re-soldered. This is a job for a qualified plumber. Do not attempt to repair a soldered joint with tape or sealant as this will not hold under pressure.
- After tightening or replacing the joint turn the water supply back on slowly. Check the joint for leaks. If the joint is dry the repair is complete. If the leak persists tighten the joint further or replace the fitting.
- If the pipe itself is damaged cut out the damaged section and replace it with a new length of pipe. Use a pipe cutter for clean cuts. Connect the new section with compression fittings or push fit fittings.
- To prevent future leaks check joints annually for signs of corrosion or dampness. Tighten any loose nuts. Replace old washers and olives when they show signs of wear.
- If you are unsure about any step or the leak is in a hard to reach location call a qualified plumber. Water damage from a persistent leak can be costly to repair.
Common Symptoms & Diagnostic Resolutions
Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.
| Symptom / Code | Likely Root Cause | Recommended Resolution |
|---|---|---|
| Joint still leaks after tightening | Worn olive or damaged thread | Replace the olive and re-tighten. Apply PTFE tape to the threads. |
| Leak from push fit joint | O-ring damaged or pipe not fully inserted | Push the pipe in fully. If the leak persists replace the fitting. |
| Pipe is corroded | Long term leak or age | Cut out the damaged section and replace with new pipe. |
| Leak from soldered joint | Failed solder joint | The joint must be re-soldered by a qualified plumber. Do not attempt to seal with tape. |
Frequently Asked Questions
How do I fix a leaking compression joint?
Tighten the compression nut a quarter turn with a spanner. If the leak persists replace the olive inside the joint. Apply PTFE tape to the threads for extra sealing.
Can I fix a leaking pipe joint myself?
Yes for compression and push fit joints. Soldered joints require a plumber. Turn off the water first and place a bucket under the joint to catch drips.
What is an olive in a compression joint?
An olive is a small brass ring that sits inside the compression joint. When the nut is tightened the olive compresses against the pipe creating a watertight seal.
How do I stop a pipe joint from leaking?
Tighten the nut or replace the olive. For push fit joints ensure the pipe is fully inserted. For soldered joints call a plumber. Regular maintenance prevents leaks.