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The L&L T-G-E140/00* 14-gauge Type-K thermocouple includes a high temperature plastic terminal blocks that is for use for older kilns only and is not normally recommended. Newer kilns use 8-gauge thermocouples.
Older ones used 14-gauge. It is recommended that you drill out the brick in older kilns to accept the larger diameter 8-gauge thermocouples. If you prefer not to do that, purchase the 14-gauge.
All electrical parts and thermocouples are non-returnable. Please make sure you are buying the right one. While Type-K thermocouples are all the same electrically, the kiln manufacturers use different styles, lengths, diameters, and also add mounting hardware for particular applications. Therefore, thermocouples are not plug-in compatible / interchangeable with one-another. It's important you purchase the correct one for your brand/model of kiln. We stock some thermocouples but not all. Some are direct shipped from the manufacturer.