This Lucas 5k resistor cap is perfect for electronic ignition systems like Tri-Spark, Boyer, Pazon, etc. This waterproof 90 spark plug terminal fits 7mm and 8mm wire, and is designed for a threaded terminal spark plug. To install screw into spark plug wire, unscrew the terminal on your spark plug, and push on for positive and waterproof connection.

Resistor spark plug caps are suggested with electronic ignitions to help suppress radio interference with the ignition controller. They are to be used with non-resistor plugs, if using resistor plugs they are not necessary. Replaces the discontinued NGK LB05E cap. Sold individually.