Performance Tool W80577 Compression Tester

Compression Tester Spark Plug; Kit contains the necessary sizes to test compression most gas engines. Includes: 10 mm x 1.0, 12 mm x 1.25, 18 mm x 1.5 and the special 16 mm x 1.5 Ford adapter. Fits our compression tester W80579 and others with a 14 mm x 1.25 Inch male thread. Rubber O-rings insure a positive seal and accurate readings.