From the Manufacturer:
Water replacement spout kit includes: Yellow self-venting spout with rubber gasket, and stopper. 
 
This spout is not meant for use with any RotopaX or FuelpaX fuel container. Use of this spout in any fuel container will render the container illegal for use in the United States and will void all warranties with the associated products. All spouts come with a 30 day warranty on them.