Champion 502 D21 Industrial Spark Plug with Resistor

The Champion 502 (D21) is a heavy-duty industrial spark plug engineered for reliable performance in tractors, stationary engines, and industrial equipment. This spark plug features advanced technology to deliver consistent ignition while protecting sensitive electronic systems from interference.

Key Features:

• Patented high-voltage semiconductor resistor provides maximum EMI suppression to protect electronic components
• Copper core center electrode enhances heat dissipation and reduces engine misfire caused by fouling
• Triple seal assembly with upper and lower metal gaskets plus Sillment seal eliminates failures due to heat or mechanical stress
• Triple-coated shell with Tintac and Ultraseal over zinc plating resists corrosion and prevents spark plug seizure
• Designed for industrial and agricultural applications requiring dependable spark delivery

This industrial-grade spark plug delivers the durability and consistent performance needed for demanding work environments. The advanced sealing technology and corrosion-resistant coating ensure long service life even under harsh operating conditions.