【Perfect Fitment】: Fit for No Fault Heater and PDR Heater, Compatible with Hot Spring,Limelight, Hot Spring pre 89,Tiger River models from 2002 to 2023.Part number 34-01395-K. 【Upgrade Design】: Newly designed and with O-ring, includes 2 Pin High-Limit Thermistor Sensor 79005 and 4 Pin Control Thermistor 79006.replaces the obsolete 39204, 39205, 39525, 39530. .