Step 6 · Test for Leaks
This is a critical step that must not be rushed. Ensure the new valve is in the 'off' position. Go to the main water shut-off valve and turn it on SLOWLY. Listen for the sound of rushing water filling the pipes. Once the sound stops, return to the access panel. With a bright flashlight, carefully inspect every single soldered joint for any signs of moisture. Look for even the smallest bead of water or a slow drip. Check the connections for a full five to ten minutes to ensure they are completely watertight. If you find a leak, you must shut off the water, drain the system, and re-solder the faulty joint.