The Gunson G4055B Hi-Gauge Adaptor Kit 12mm has been designed to convert the thread on Colortune and Hi Gauge Compression Testers to fit most popular sizes of sparkplugs that are fitted to a variety of vehicles, including: most modern and classic cars, motorcycles, garden machinery and boats. This package contains 1 x 12mm thread adapter and a soft copper washer to ensure a reliable seal. Suitable for use with Gunson G4101 Compression Tester and Gunson G4074 Colortune.
