*** The Original EGT repair fitting *** Your truck deserves the highest possible quality. We developed this product in 2013 as a means to save people (including ourselves) from expensive repairs. It has proven successful to more than 2000 satisfied customers. Thank you for your business! For superior weldability, our fittings are precision CNC machined in house of grade 304 Stainless. Each one is individually test fitted with an actual sensor before packaging, Avoid imitations. Call them whatever you want: weld fittings / mounting bosses (OE style) for GM Duramax Diesel EGT sensors. No longer will an expensive emissions aftertreatment component need to be replaced if a seized temperature sensor breaks off. Now you can simply weld one of these in place of the old one, or drill a hole and weld it next to the old one, then install a new sensor. These 14mm X 1.50 EGT sensor bosses will work with Duramax Diesels of several model years, and many commercial trucks using 14mm EGT sensors of the same type. This listing is for the weld fitting only, the sensor is sold separately at your local Chevrolet or GMC dealership. (works with sensor part numbers: GM 12623113, 12598443, 12622554, 12623114, 12633560, 12633612, 12637488, 12643373, 12639455, 12642451, 12598444, 12643246, 213-4778, 12622555, 213-4589, and aftermarket equivalents ie: Standard ETS75). These are precisely machined to exact specifications for use with OE style Duramax EGT sensors with the aforementioned part numbers and supersessions or equivalents thereof. We offer a free exchange lifetime warranty on our product against flaws in materials or machining with proof of purchase. An installation tutorial is available at our website. 2013-2019 JTE Products LLC. All rights reserved.