- One-piece fired-in suppressor seal blends three glass types to create 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 the center and ground electrode provides excellent durability and consistent voltage demands to help reduce wear on the ignition system. - Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance. - Some GM Original Equipment parts may have formerly appeared as GM Parts (OE) or Professional. - GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors. - GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. - Use scenario: Replacing ignition components on a Chevrolet, Buick, GMC, or Cadillac to restore reliable ignition performance with durable, long-life operation. - Use scenario: Reducing radio frequency and engine interference in vehicles where ignition noise can affect electronic systems or radio reception. - Use scenario: Enhancing durability in engines with higher compression pressures or when long-life, low-wear ignition performance is desired.