Fiberglass pipe fittings include products such as fiberglass flanges, elbows, tees, four-way tees, and reducing tees (also known as transition pieces), as well as corresponding composite pipe fittings for fiberglass-reinforced plastic (FRP) composite pipes. Fiberglass pipe fittings and FRP-PE/PP composite fittings offer superior chemical resistance, showcasing unparalleled advantages in corrosive environments compared to other materials. They can withstand a variety of acids, bases, salts, and organic solvents, resulting in a long service life.