Compression Tester Spark Plug

This 4‑piece compression tester spark plug adapter set is made of solid brass for engine compression test work. The compression tester spark plug adapters fit multiple common spark‑plug thread sizes for gasoline vehicles. This brass adapter features precise threading and sealing rubber rings to prevent air leakage during measurement. Each brass adapter delivers high durability against wear and heat under workshop working conditions. This engine compression test accessory connects compression gauge to cylinder spark plug hole quickly. The engine compression test helps mechanics read accurate cylinder pressure data for engine fault diagnosis. This compression tester spark plug brass adapter kit is compact and easy to store. This brass adapter set is essential auxiliary parts for professional engine compression test in auto repair shops.