Step 8 · Turn On Water and Check for Leaks
This is the moment of truth. Go back to your main water shut-off valve. Turn it on SLOWLY, only about a quarter turn at first. This allows the pipes to fill with water under less pressure, reducing the shock to the system. Immediately return to the access panel with your headlamp and dry paper towels. Meticulously inspect every connection you made: where the supply lines connect to the valves, and where the valves connect to the spout. Wipe each connection with a dry paper towel to easily spot any moisture. If all is dry, go back and open the main valve all the way. Check for leaks again.