Fits the Letro Pentair LA01N 3/4 horsepower pool cleaner booster pump. This pump volute o-ring fits the new style letro booster pumps manufactured after 1997. This part is designed for the Letro LA01N Booster pump for use with Legend , Legend Platinum & Legend Platinum Truck Series cleaners. Part Number: LA415 Note: Checking for leaks: Inspect and check to see if the leak is between the shaft and the seal. If so, replace seal. If the leak is between the bracket and the seal, then check the bracket for cracks. If cracked, then replace bracket and seal. If not, then change seal. Inspect bracket and impeller for cracks. If the impeller seal pocket is damaged, pump was run dry and the impeller will need to be replaced. This kit will fix seal leaks only! you must determine if all other related parts (bracket & Impeller & motor) are in good shape.