Spark Plug Adapter - 18 mm: H

IPA7885 Spark Plug Adapter - 18mm Features and Benefits: Now you can put a standard spark plug in the large old style hole Adapts any 14mm spark plug hole thread to 18mm Use with top dead center indicator #7880 / #7886 Use with crank stopper #7876 Use with compression gauge extension #007881 18mm male threads x 14mm female threads