Lisle 20280 Adapter

Lisle 20280: Spark Plug Adapter, Compression Tester Component, 14mm Adapter Thread Size, Brass, Each – Lisle compression tester spark plug adapters are available in several sizes and can be used with their compression tester. Without good compression, your engine will run, but it may do so poorly! Be ready to run compression tests with spark plug adapters from Lisle.