The Brower OP321 float replacement is manufactured from high density poly and threaded at the top to accommodate the appropriate valve arm. The float is 3 1/2" x 4 1/2" x 3" and will create buoyancy to shut the valve on and off in your Brower automatic waterer.
Pair with the appropriate valve arm to accommodate your waterer. Place horizontally or vertically in your waterer according to the space available.