Precision Engineering: Designed with exacting specifications to ensure a precise fit within the pump assembly, contributing to reliable performance and preventing issues such as leaks or inefficiencies in high-pressure applications. Broad Compatibility: Suitable for use with Pentair WaterFall™ pumps and Challenger® High Pressure Pumps from 2 hp Full Rated through 3 hp Up-Rated, including specific models such as 2F and 2-1/2 A built prior to October 1, 1992.