⚡ SheetCraft is experimental — send feedback or vote on guides to help us improve.

How to Fix a Leaky Pipe Joint

mediumHome Repair1-2 hours8 steps

Safety Warnings

  • Shut off the main water supply before starting to prevent flooding.
  • Use caution when handling metal pipes to avoid cuts from sharp edges.

Tools Needed

Pipe wrench — check locally
Buy →
Adjustable wrench — check locally
Buy →

Materials

Pipe sealant or tape — check locally(1 roll)
Buy →
Replacement washers — check locally(as needed)
Buy →

Steps

1
Shut off the water supply to the affected pipe joint.
Tip: Open the lowest faucet in the house to drain remaining water from the lines.
2
Disassemble the joint by unscrewing the connecting nuts or fittings.
Tip: Use a pipe wrench for a secure grip on metal piping.
3
Inspect the joint and washers for wear, corrosion, or damage.
Tip: A worn plunger washer is a common cause of leaks in supply valves.
4
Clean the threaded areas of the pipe to remove old sealant or debris.
Tip: Ensure surfaces are smooth for a watertight seal.
5
Replace worn washers or corroded components if necessary.
Tip: Replace the entire assembly if it is badly corroded.
6
Apply new pipe sealant or thread tape to the joint.
Tip: Wrap tape in the direction of the threads.
7
Reassemble the joint by tightening the fittings.
Tip: Tighten firmly, but avoid over-tightening which can crack the fittings.
8
Slowly turn the water supply back on and check for leaks.
Tip: Wipe the joint with a dry cloth to see if any moisture appears.

Pro Tips

  • Always check the supply valve first if you suspect a leak in the line.

Was this guide helpful?

Share this guide

Sources

Synthesized from 2 verified sources:

USDA Farmers' Bulletin (Gutenberg)View →
Gutenberg: Simple Plumbing Repairs (FB 1460)View →