Re: Universal M-18 Heat Exchanger
If you look at the pics in this thread, what do you have where it says "zinc" in the pic?
Universal M-18 Heat exchanger
Your description isn't very clear but it sounds like the hole has been plugged with a copper plug. Why can't you remove it and install the proper zinc/brass part?
A picture would say a thousand words in this case.
1984 Bristol 31.1
Alameda, California, USA
Last edited by MarkSF; 12-07-2012 at 12:18 AM.