Kozy Resort, Auto Refill w/Base. Made of durable materials to resist corrosion and scale build-up. Water supply line is hidden in the pedestal. Simple set-up. Automatically refills after birdbath is emptied for cleaning. Air pressure forces water from the reservoir to rise to the same height in the birdbath. The KozyFill runs off gravity / no electricity is needed. Will not crack in winter or in freezing temperatures.