Draper-Expert-94269-Adaptor-Engine-Compression-Cylinder-Leakage-Testers-200mm-Draper-Expert-94269-Expert-Quality-used-in-conjunction-with-petrol-compression-testers-enabling-the-compression-tester-to-be-connected-when-spark-plugs-are-deeply-recessed-inside-the-cylinder-head-Examples-of-recessed-spark-plugs-can-be-found-in-but-not-exclusive-to-Nissan-BMW-Ford-Vauxhall-Saab-Renault-&-Honda-engines-br-Draper-Expert-94269-Adaptor-Engine-Compression-Cylinder-Leakage-Testers-200mm