The MFJ ATU (Antenna Tuner Unit) offers a range of parts and accessories to enhance its functionality. These include replacement knobs, power cords, and coaxial cables. Additionally, there are options for different types of connectors, such as BNC and PL-259. Users can also find replacement fuses and capacitors to ensure optimal performance. Whether you need to replace a worn-out component or customize your ATU setup, MFJ provides a variety of parts and accessories to meet your needs.