Plastic steel self-locking C-type quick connector is a connecting device widely used in pneumatic tools and equipment, especially suitable for air compressors, air pumps, air ducts, woodworking tools and other equipment. Its design is unique and adopts a self-locking design. Once connected, it is not easy to loosen, ensuring the reliability of the connection. In addition, the plastic steel material has good durability and is not easy to deform, allowing this joint to maintain good working condition even after long-term use.