Drain Plug Screw

Commonly known as the bung, this is the screw in plug for the hole on the stern of the boat, always good to keep a spare in your sail bag. This drain plug is specifically made to fit the tread pattern and diameter of the hole in the stern of the boat. 

I have seen many bungs go 'missing' in boat parks throughout my years, so make sure that you always have a spare handy, so that your day on the water doesn't get ruined by a missing drain plug for your ILCA.