Pentair Sta-Rite K-Series S20P4HS10221-024" Submersible Pump and Motor 2-Wire 1 HP 20 gpm 230V. The K-Series 4” Submersible Pumps in 5, 7, 10 and 20 GPM models offer dependable performance and value. K-Series pumps will handle dry run conditions. Proven “Floating Impeller” staging system is designed with a corrosive resistant stainless steel wear surface that greatly reduces problems with abrasives and sand lock-up. Powered by water-filled submersible motors.