CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
Williams electromechanical 100 stepper unit plunger.
7/16 inch diameter. Notch is 3/8 inches wide.
Used on 100 step units.
Reference:
2A-2051