Furnace and Waterheater Thermocouples
Universal Thermocouple
A universal thermocouple automatically turns off a heater's (gas water heaters, boilers, space heaters, etc.) gas supply if the pilot light goes out. These thermocouples need to be replaced periodically because the tip can become corroded. A pilot flame that is predominantly blue and ash on the tip are indicators that the universal thermocouple should be replaced. BuyAceHardware.com carries Ace brand and Honeywell thermocouples.