This tap is supplied with all our AutoPot Water Barrels. It can also be added to any plastic container if you decide not to use the AutoPot Water Barrels. Simply drill a hole near the bottom of the container and insert the tap. Please make sure you have sufficient access to the inside of the tank as you will need to secure the tap from the inside. If you are unable to reach inside the tank you have the option of using a 16mm or 6mm Top Hat grommet.