Spark Plug Gap Expansion Tool
Safely expand the spark gap of any massive electrode aviation plug.
This tool expands the spark gap of any massive electrode aviation plug safely and efficiently. Simply hook the tool under the outer electrode and apply a bit of downward pressure to gently and safely expand the gap without any contact to the center electrode. No risk of cracking the ceramic casing which could result in reduced spark plug performance or total spark plug failure. 5.6″ long, .375″diameter. Made in USA.