This spark plug is designed with a resistor to prevent interference from electrical noise from FM radios. That's what the "Z" in the product number stands for. I could use a regular model that doesn't have a "Z" in the product number. The outboard motor in my boat comes with these spark plugs. So I'll stick with what's out there. I can't find these spark plugs at any of my local marine stores. I'm glad I can order it online.
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