The "ULTIMATE WEAR RING" is the finest wear ring avaIlable on the market today. It is very easy to install, it is a one piece unit that does not have an insulator that can spit out, it increases the "Hole Shot" of the pump, and it uses less HP by decreasing the coefficient of friction of water and cohesion between two metal surfaces running in water. The standard size is made to fit a new impeller with a wear ring surface diameter of 7.225". The .010" undersize fits an impeller with a wear ring surface diameter of 7.215" and so on down the line of the sizes available. USPatent# 5324560
Fits Berkeley, Dominator (after serial #1444), American Turbine, Legend, & Aggressor Jet Drives.