Overview Reviews Product Description For testing on some automobile, motorcycle, ATV, chainsaw and marine gas engines. Includes o-ring. Lisle Tools Catalog Product Videos Custom Field Harmonization code HTS #9026200900 Manufacturing country US Product Reviews Write a Review Write a Review × Lisle M12 Spark Plug Adapter 20540 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *