Intermatic Fireman Switch 156T4042A
This switch provides coordinated control for any pool/spa heater and any filter pump. It is designed to run OFF a gas fired pool/spa 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.
This Fireman Switch is designed to work with all T100 and T1000 Series Time Clocks.