XXH (Double Extra Heavy) is a high-pressure rating for pipe fittings designed to withstand extreme operating conditions. Commonly used in industries requiring robust and durable connections, XXH fittings—including nipples, elbows, tees, concentric reducers, and swages—are manufactured from materials such as carbon steel and stainless steel. These fittings are available in various diameters and sizes, ensuring compatibility with demanding piping systems where enhanced strength and pressure resistance are essential.