Step 9 · Testing the System

This is the step most people slow down on. Take it one move at a time — there’s no rush, and you can rewind the clip as many times as you need.

Before closing the walls, you must thoroughly test the new system for leaks. Double-check that all fixture shutoff valves and all individual ports on the manifold are in the closed position. Go to the main water shutoff valve and open it only about a quarter of the way. This allows the pipes to fill with water slowly, preventing a sudden pressure surge (water hammer) that could damage fittings. Listen for the sound of running water to stop, indicating the system is full. Then, fully open the main valve. With the system under full pressure, meticulously inspect every single connection you made. Use a flashlight and a dry paper towel to wipe each fitting and check for even the smallest amount of moisture. Let the system remain under pressure for several hours (or as required by your permit inspector) and perform another thorough inspection.