Adding a little "levity" here: If the photo you posted above is from your car, then it will be a coolant drain very soon! That part is one of your engine block core/freeze plugs and its looking rusty, weak and will begin to leak sooner than later. Depending on the access, a special tool may be required to install a new plug.
https://www.amazon.com/OTC-4603-Frost-Remover-Installer/dp/B000XSGKYO