NGK Right Angled Spark Plug Cap – moulded from plastic to include NGK branding on the top, this plug cap is supplied with a rubber waterproofing boot to fit around both the cable joint and the plug itself. The cap grips the fine thread on the top of the plug, so it is necessary to remove the screwed-on bullet type cap form the plug before fitting. Screw fit to the plug wire, This cap features a 5k ohm resistor and should not be used with spark plugs with a resistor already fitted.