Winterizing is Coming

I'm starting to noodle out how I'll winterize the many systems aboard Sensei. Below is a picture of the sea strainer that feeds raw water to the engine. There are similar strainers for the generator and the air conditioners.

I had the idea of buying a spare cap that I could drill a hole in to install a fitting to feed antifreeze into the sea strainer. But, it turns out that when I started researching this idea I found that someone else has already created just what I need:

Perfect! It's made by a company called TRAC, called a TRAC Flush Cap, and it's available on Amazon.