What's a Freeze Plug??? 

One good way to inspect your freeze plugs or check for leaks is with one of these mirrors on Amazon → www.amazon.com/...
Here's the link to spelunkerd's channel → / spelunkerd
Here's a link to his radiator cap video → • Hidden genius behind a...
What's a Freeze Plug??? I made this video to answer that question using an "Iron Duke" from my brother's boat to demonstrate.