One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance Some ACDelco Gold parts may have formerly appeared as ACDelco Professional Premium aftermarket replacement part Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models