Bullet Proof Diesel EGR Coolers feature patented H-Core technology developed to resist the common causes of EGR failure. The H-Core technology is designed to allow for the natural expansion and contraction of cooling tubes inside the EGR cooler, which helps limit structural failure. It also increases the surface area of the coolant tubes within the EGR coolers, making them more effective heat exchangers. These coolers are designed as a solution for fleet managers who experience repeated EGR cooler failure within fleet vehicles.