Step 7 · Test for Leaks
The final step is to check your work for leaks. Ensure all faucets that you opened earlier are now fully closed. Go back to the main water shutoff valve and turn it on *very slowly*. Turning it on too fast can cause a 'water hammer' effect that can damage pipes and fittings. As you slowly open the valve, listen for the sound of pipes filling and for any abrupt hissing or spraying noises. Once the valve is fully open, return to your work area. Carefully and thoroughly inspect the new fittings on both the galvanized and PEX sides. Look for any signs of dripping or moisture. For a definitive check, wipe each connection point with a dry paper towel and then observe the paper towel for any damp spots. If all connections are dry after several minutes, open a nearby faucet to test flow and flush out any air or debris in the line. Your replacement is complete.