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About the T104R201 208277V DPST 2Circuit 24Hr Mechanical Timer with Steel NEMA 3R CaseThe Intermatic T104R201 provides coordinated control for your heater and filter pump operations. Eliminating the problems of knocking due to overheated water, the T104R201 is a twocircuit switch designed to turn off gaspowered swimming pool heaters approximately twenty mintues before the fitler pump shuts down. The addition of the Intermatic T104R201 can help reduce scale and lime deposits in your pool heater and can greatly increase the product longevity. This timer features a 24hour analog dial that allows for up to 12 onoff operations per day, with one set of "ON" and "OFF" trippers supplied with each switch. Each ONOFF setting requries a minimum of 1hour. The unit is also enclosed in a steel NEMArated 3R case to prevent any damage or tampering of the timer. Intermatic backs the T104R201 with a 1year manufacturer#39;s limited warranty.