NGK TR55GP G-Power Spark Plug | Replaces 12 14 SP405 SP417 SP433 SP459 SP470 SP479 SP486 SP491 SP493 SP500 SP521 SP523 41-902 AGSF22F1 AGSF22FM AGSF22WM.

G-Power Platinum Alloy Spark Plugs offer superior performance with improved fuel efficiency, lower emissions, and quicker starts. 0.6mm laser welded fine Platinum tip reduces required voltage ensuring high durability and a consistently stable spark. Special configurations are used for the insulator noses to improve throttle response and prevent fouling with corrugated ribs on insulator to prevent flashover. Platinum alloy ground and center electrode for greater spark while ensuring precise gap during the life of the plug. Trivalent Metal Plating offers superior anti corrosion and anti seizing properties while the triple gasket seal eliminates combustion gas leakage. Simply the best platinum spark plug at an economical cost.