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Shouldn't there be a socket like tool that fits those groves or something?

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By accident, I discovered that the blade of my gasket scraper tool fits in those slots perfectly!

I just put it in sideways (90 degrees to the fitting) and pulled on the screwdriver handle.

Pipe wrench probably still works best for getting them out, but I usually destroy them in the process.

So on my motor I bought new fittings, and installed them with teflon tape and the side of my gasket scraper. No leaks and no gouges from the pipe wrench!