RPI H2O Animal Hydration Tough Guy Automatic Waterer with Drain for pets, 1.5 gallons

Is there quaranteed auto-shut-off?

Could I attach this to an aluminum fence? (With 3-4inches in between all of the slats...)

does it have auto fill

Question for manufacturer: Do you take any measures to prevent UV exposure outdoors from breaking down the polypropylene plastic?