An HDPE duct coupler is a type of fitting used to connect two pieces of HDPE duct together in a pipeline system. It is made from high-density polyethylene, which is a thermoplastic material known for its strength, flexibility, and resistance to environmental factors like moisture and chemicals. HDPE duct coupler fittings are commonly used in applications such as telecommunications, electrical cable installations, water distribution systems, and other underground utilities. The purpose of the coupler is to provide a tight, secure connection between two sections of HDPE pipe, ensuring the integrity and efficiency of the entire pipeline system.