everfill 33 gallon bowl
I have a bunch of these for my ducks and geese (also guineas, chickens, cats, dogs and assorted not-always-welcome wildlife) and I love them. we have had to put stronger clamps on the feed hoses on some of them because the geese stand on them and break them loose while trying to swim in the bowls. Another reason I live these water dishes is that the big ducks and the geese can't use them as swimming pools. Having tried many different auto water dishes over the last 15 years I vote these the best.