Compatibility: This temperature sensor is a replacement part for spa temperature sensors and is designed for use with hot tubs. It is a reliable hot tub heater sensor that helps maintain the desired water temperature in your spa system. This temperature sensor is compatible with the following models: - J-270, J-280, J-355, J-365, J-375 (2007 and newer) - J-210, J-220, J-230 (2005 and newer) - J-200 LED models - J-325 (2005–2007) - J-335, J-345 (2004 and newer) - Del Sol models (2003–2005) - J-320, J-330, J-340 (2002–2003) It helps resolve common hot tub error codes such as OH or ICE on Sundance spas by accurately monitoring water temperature. Easy installation: Disconnect the old sensor and connect the new spa temperature sensor by splicing the wires and securing them properly to the control board. Additional compatibility includes: - 880 Systems (2005 and newer) - 850 Systems (1997–2005 and 1997 and newer) - 400, 600, 600-S, 750, 800, and 850 Systems - Suncoast (1992) - Suntub SVDV Systems (models 496–498) Replaces part numbers 6600-138 and 6600-105. Interchangeable with 6600-182 (stainless steel) sensor with box end connectors. For inground spas without a skirt, refer to model 6600-169. Also fits: - J-300 LCD Series (2002 and newer) - J-350, J-360, J-380 (2002–2003) - J-355, J-365, J-375, J-385 (2004–2006) - All J-400 models (2006–2009) Part Name: Temperature Sensor Part Number: 6600-166 Material: Plastic Color: Black Package Contents: 1 x Temperature Sensor Note: The image may slightly differ from the actual item due to lighting and display variations. Measurement may vary by +/- 1–3 cm.