This is the rubber cap part for the BCD436HP's GPS/serial port. You can replace this part without disassembling the scanner. Press the top of the tab on the rubber part into the hole in the scanner's case. Then, gently press the bottom of the tab fully into the hole using a small flat-head screwdriver.
Product Overview
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov