What are the necessary steps for installing a washing machine connection box?

To install a washing machine connection box, follow these steps:

1. Turn off the water supply and disconnect the existing water lines.
2. Cut a hole in the wall for the connection box.
3. Install the connection box securely in the wall.
4. Connect the hot and cold water lines to the box.
5. Install the drain line into the box.
6. Turn on the water supply and check for leaks.
7. Test the washing machine to ensure proper functioning.