This retaining ring secures the shearpin in place on the end of the motor's drive shaft in SE30 and SE40 thrusters. Refer to the accompanying images for details.
You may also know these "retaining rings" as "circlips" or "lock washers."
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm.
www.P65Warnings.ca.gov