Waterway Executive 2.0 SPL [9.0A] [2S] Pump (3421021 1U) circuitboards A specialized valve like this A specialized valve like this is useful because it allows the shutoff function to fit directly into applications where one side of the line terminates at a tank style flange rather than conventional plumbing the whole pump can lose the secure and dependable feel it should have The Waterway 3421021 1U Executive pump is designed for compatible applications and features a 2 A pump like this is useful because it restores the full equipment assembly in systems where the original Executive pump needs a direct and compatible replacement