Spark Plug Caps for Modern, Vintage and Classic engines supplied by NGK. Also known as spark plug resistor, the NGK plug caps are probably the best there is on the market. With the NGK spark plug symbol code, it is possible to identify specific features of an NGK spark plug cap by decoding it's part number. Please be aware that NGK make a much wider variety of spark plug caps than those available to the UK aftermarket.
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