A ductile iron MJ collar, or Mechanical Joint collar, is a crucial component in piping systems, especially for ductile iron pipes. It serves as a means to connect two pipes securely without welding. The collar typically consists of a grooved sleeve and a gland, which are tightened together using mechanical bolts and nuts. This creates a tight seal, preventing leaks and ensuring the integrity of the pipeline. MJ collars are widely used in various applications, including water distribution networks, sewer systems, and industrial piping, due to their reliability, ease of installation, and ability to withstand high pressure and mechanical stress.