Step 7 · Test the System for Leaks

With the drain capped and the new angle stops in the closed position, you can now test for leaks. Go back to the main water shutoff valve and turn it on slowly to allow the pipes to fill gradually, which prevents water hammer. Return to the bathroom and carefully inspect all the new PEX connections and the threaded connections at the angle stops. Look and feel for any signs of moisture. For a more thorough test required by some codes, you can attach a pressure test gauge to one of the angle stops or an outdoor spigot and pressurize the system to check for any pressure drop over time.