by Fix This House
Two methods to fix a leaking copper pipe: torch soldering and press-fit fittings
Learn how to fix a leaking copper pipe using two proven methods: traditional torch soldering and modern press-fit fittings. This guide covers everything from shutting off water to completing a watertight connection.
Locate and close the main water shut-off valve in your home. This is typically found in the lowest part of the house. Open a faucet to drain residual pressure from the pipes.
Use a close-quarters tubing cutter to remove the leaking section of copper pipe. Make cuts on both sides of the damaged area, ensuring clean edges for new fittings.
Use emery cloth (120-grit sandpaper) to clean the outside of the pipe ends until shiny. For torch method, also clean the inside of fittings. Remove all oxidation and old solder.
Apply plumbing flux to the cleaned pipe ends and inside of fittings. Use only enough to coat the connection area - for a 3/4 inch pipe, apply flux about 3/4 inch from the end.
Fit the coupling or elbow onto the pipe. Heat the bottom of the connection with a propane torch until the solder melts and flows. Let cool, then wipe excess flux with a wet rag after cooling completely.
Slide the press-fit fitting onto the pipe, ensuring it's fully seated. Mark the depth position. Use a Milwaukee hydraulic press tool to crimp the fitting until it clicks and releases.
Turn the water supply back on slowly. Check all connections for leaks. Press-fit connections can be tested even with standing water in the pipe.