TMNT Triple Opto Switch ReceiverOpto Switch Triple Receiver Stern TMNT Unleash ninja level precision with the Opto Switch Triple Receiver for Stern's Teenage Mutant Ninja Turtles pinball machine. Engineered for smooth gameplay and shell tastic performance, this essential upgrade ensures your game stays as sharp as a katana! Cowabunga worthy quality for true TMNT fans! This is located in: Upper Lock 1 Upper Lock 2 Upper Lock 3 Stern p n: 520 8451 00