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When I was searching the net, I found that thermocouples come in all shapes, sizes and styles. I didn't have much luck in finding a definitive site with great pictures of a thermocouple. Not to mention the number of applications for thermocouples beyond heaters and water tanks. But, the easiest way to locate your thermocouple would be to find your pilot light and look for the "tube" that run from where it is to some kind of electrical switchbox. The main key is that your thermocouple ISN'T going to run back to the gas line. Anything going from your pilot light to the gas line is probably the gas supply line for the pilot light. Again, I'm kind of new at this and somewhat of a "dare devil" as I actually replaced the gas valve on my furnace a few years ago with no knowledge of gas or plumbing. (It was an emergency situation where the gas man came out and disconnected the furnace due to a leak at the valve on a Saturday morning. He left me with instructions on how to install the new valve and I tried it!)
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