NGK Spark Plugs B, C, D, I per Unit

Price per UNIT. High-grade silicate ceramic creates a stronger insulator to reduce dielectric punch-through. Cold-rolled threads prevents cross-threading and damage to cylinder heads. 98% pure copper core increased heat dissipation for reliable starts, prevents spark plug overheating. Marine-specific resistor prevents RFI interference with electronics. Trivalent plating resists corrosion (especial