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Straight spark plug HT cap, black phenolic moulding with 5K OHM carbon suppressor, overall length 70mm. Will suit older vehicles. Threaded spur screws into the core of the HT/ignition cable. 4mm diameter steel socket fits directly onto the threaded stud on top of the spark plug - meaning that the 6.3mm diameter waisted steel cap needs to be unscrewed from the top of the plug first.
