The Petersen Waterer Copper Ball Float is the standard and most recommended float. The 5" Corrugated Copper float will help regulate the waterer level in your Petersen Concrete Waterer.
The float is found in the following automatic waterer models
44C, 74H, 120H, 144, 25, 250, 300, 350, 400, 450, 500, 650.