The Napa Echlin ST88 is a 4-terminal starter solenoid switch designed for FMC and LMC Aviation vehicles with a 24V 60A power requirement. This bolt-on solenoid switch is a vintage part manufactured in the United States and features a matte finish. It is a reliable component with interchange part numbers U958, SS934, SW119, 1M1365, and SBC2155, providing a direct replacement for compatible vehicles. Additionally, the product comes with a California Prop 65 warning for potential cancer and reproductive harm.