Intermatic DPST 220 Volt Mechanical Time Switch with Fireman’s Switch

Intermatic DPST 220 Volt Mechanical Time Switch with Fireman’s Switch*This model is designed to turn OFF a gas fired swimming pool heater approximately 20 minutes before the filter pump shuts down. This eliminates the problem of pounding and knocking due to overheated water, reduces scale and lime deposits and extends the service life of the heater.