Pentair 470190 Water Pressure Switch Replacement Pool and Spa Heater Water pressure switch replacement Fits Pentair MiniMax NT STD heater with 6800 controller, PowerMax and MiniMax Plus heater models 150, 200, 250, 300, 350, 400 Also fits Pentair MiniMax and PowerMax commercial heaters Compatible with Pentair MiniMax commercial heater with CSD-1 controls and MiniMax commercial low NOx heater