Posted by jdemaris on December 15, 2007 at 07:56:41 from (67.142.130.27):
In Reply to: welch plug posted by larryinwa on December 15, 2007 at 05:59:35:
To be technical, a "Welch plug" is a concave disc used to protect engines from freeze damage. The other types of "freeze plugs" shaped like cups are not of the Welch design.
Like many terms and words, this one tends to get used generically. I was tought early on the difference from what was called a Welch plug - and other types of expansion plugs. But, that was over 50 years ago.
The Welch plug was invented by the guys that owned the Welch car company in Michigan, and the original idea was gotten from sticking a coin into an engine coolant port - which later got patented to a concave disc.
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