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OEM replacement defrost thermostat for Frigidaire refrigerators (part 55-5304521781). Owners report easy installs and reliable fixes, with a few packaging complaints to check for.
Replacement kit containing a WR51X10055 defrost heater, WR55X10025 temperature sensor, and WR50X10068 defrost thermostat. Good value and compatible with many GE/Kenmore part numbers, but owner feedback on longevity is mixed.