I mainly use polypro fittings in my setup, 1/2" NPT or 1/2" hosebarb. They both grip and seal quite well. I also use some Colder quick-disconnect fittings with seals on some parts to make swapping components easier.... I've also replumbed the radiator with 1/2" npt fittings to accept whatever I want to screw into it.
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That which does not kill me had BETTER do enough damage to keep me from firing back!
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