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That is why I have a small lathe in the garage. What diameter is the ID of the frost plug hole? What pipe thread is the block heater? Years ago in desperation I have done what you are thinking of with turning the part with a drill press and grinding it close then sanding, it can work depending how much material needs to be removed. Is the frost plug large enough to drill and braze the NPT adaptor to it?
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Last edited by 908/930; 10-24-2025 at 09:46 AM..
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