The best way is to replace the drain hose including drain valve and the nut that fits onto the ball valve. To do this, two people can handle it the easiest and fastest. It does not require any experience or similar expertise when the following instructions are followed.
Silicone is placed on the threads of the upper connection part and smeared on the threads. This is to seal so it cannot leak through the threads.
The connector is placed in the hole and one person handles the hose with the white drain part and places it under the barrel to the location where the connector is located.