K&H Pet Products Bird Bath Autofill 2.5gal. Gray 10.5" Diameter - Automatically fills your birdbath! Auto-fills virtually any open style birdbath without the need for electricity! Depth is fully adjustable from 1.25 depth to 2.75 to accommodate most birdbaths Whopping 2.5 gallon easy fill tank with cap 10.5 in. diameter for stability 1 year manufacturer's warranty