Rdxcv 4PCS W80577 Compression Tester Spark Plug Adapters, 10/12/16/18mm Cylinder Compression Test Tool Spark Plug Adapter, Engine Diagnostic Tool Thread Adapters with O-Ring. Publisher: Rdxcv. Widely Applicable: These spark plug adapters are engineered to be compatible with the W80577 compression tester and other testers with M14×1.25 external threads.
