CTA Tools 2011 Compression Tester Adapter Features 12-Millimeter and 16-Millimeter Threaded Male Ends Fits Spark Plug Ports on Ford Triton Engines 8.5-Inch (22-Centimeter) Flex Hose for Easy Accessibility Works with CTA Compression Testers #2004, 2006 and 2012, as Well as Other Brands Heavy-Duty Construction Allows for Strength and Durability