NGK BPR4ES Standard Nickel Sparkplug – 6578NGK BPR4ES Spark Plug is built for long life and consistent performance. Featuring a copper core for efficient heat removal and a nickel electrode for durability, it delivers reliable ignition across small engines and equipment. Trivalent metal plating resists corrosion and seizing, while the resistor design reduces electrical interference for smooth operation.FeaturesCopper core improves heat dissipationTrivalent plating prevents corrosion & seizingCorrugated ribs help prevent flashoverCeramic insulator enhances strength & heat transferTriple seals reduce risk of leakageResistor design (5k Ohm) for interference suppressionSpecificationsThread Diameter: 14mmThread Pitch: 1.25mmReach: 19mm (3/4″)Hex Size: 13/16″ (21mm)Gap: 0.031″ (0.8mm)Heat Range: 4Electrode Material: Nickel (center & ground)Seat Type: GasketTerminal Type: Solid