Thermostat All-in-One Assembly
Perfect for tanks with either a chiller (condensing unit) or heaters (titanium) that require a constant monitored temperature range. “Compressor Only” plug is controlled by thermostat while the remaining plugs are constantly live. Convenient power switch will shut everything off in the event of emergency or service required. Johnson A421ABC thermostat can be set high or low temp. Pre-Set from our factory to “ON” at 50 (insert degrees symbol) “OFF” at 47.