3455-1 Oversize self tapping transmission filler plug

This Colony oversized self-tapping transmission filler plug is a lifesaver for vintage gearboxes. If you are working on a 1936 to 1986 4-speed Big Twin and find the threads in the transmission side cover are stripped, this is the ideal solution. It features oversized self-tapping threads designed to cut new life into damaged covers, saving you the cost and hassle of a full replacement. Colony has finished this plug in a period-correct black parkerized coating, and it features the classic OEM 701 style hex head found on 1936 to 1957 models. It maintains that authentic look while providing a practical fix for a common mechanical headache. Whether you are restoring a Knucklehead, Panhead, or Shovelhead, this plug ensures a secure seal and a clean finish.