Pentair 473605 Water Pressure Switch Replacement Pool and Spa Heat Pump Distributor Packaging Fits Pentair MiniMax CH pool and spa heater models 150 IID, 200, 250, 300, 350, 400 Also fits Pentair MiniMax NT STD, NT LN, NT TSI pool/spa heater with 6800 and DDTC controller models 200, 250, 300, 400 Compatible with Pentair UltraTemp and ThermalFlo Titanium pool/spa heat pumps