Petmate 0.5Gal. Automatic Gravity Waterer

This gravity waterer features a dispenser that slowly releases filtered water to reduce refill frequency. It includes a replaceable charcoal filter and is made from BPA-Free PET plastic. The design allows for easy refills and cleaning with a bottle that unscrews from the bowl base. Price drops from $5.90 to $4.36. Shipping is free over $35.