The mold is at the heart of the molding process and is responsible for transforming the molten polymer into pipe fittings of the desired shape and size. Mold steel is usually processed by modern technological means such as CNC machining and electrical discharge machining to improve the hardness and surface smoothness, so as to ensure the wear resistance and high precision of pipe fitting mold. The mold can contain many cavities according to the actual pipe fitting production requirements, making mass production possible. The mold base is used to accommodate the mold cavity, inserts, and components. The type of the base depends mainly on the size of the mold and the type of material used. It also includes gates, cooling, ejection, hydraulic, lubrication, etc. as well as high-quality pipe fitting molds with demolding, collapsible core system, sweeping, and sliding core.