Zodiac R0455400 Cap Sensor and Pressure Switch with O-Ring Replacement for Select Zodiac Jandy Legacy and LXi Pool and Spa Heaters Cap sensor and pressure switch replacement Fits Zodiac Jandy Legacy LRZE, LRZM pool and spa heater models 125, 175, 250, 325, 400 Also fits Zodiac Jandy LXi Low NOx pool and spa heater models 250, 300, 400 Includes o-ring