The Pentair 470190 Water Pressure Switch is a replacement pool switch for the following Pentair heater models: MiniMax NT STD heater with 6800 controller, PowerMax and MiniMax Plus heater models 150, 200, 250, 300, 350, and 400, MiniMax, PowerMax commercial heaters, MiniMax commercial heater with CSD-1 controls, and MiniMax commercial low NOx pool and spa heaters.