12 MM Adaptor Kit for Gunson Colortune See Through Spark Plug Kit.
This adapter kit connects to your standard 14 mm Gunson Colortune Sparkplug, or 14 mm Hi-Gauge compression tester, and so allows the use of those tools on engines with 10mm spark plug holes.
The set consists of the adapter itself that screws onto your Colortune or Hi-Gauge and a soft Copper washer to seal the adaptor against the cylinder head.
Please note that this kit does not include the Colortune Spark-plug itself.
The adapter can be tightened using a 19 mm or 3/4" A.F. spanner or socket.
These adapters are also available in sizes 12, 14 (tapered) and 18 mm.
Gunson Article Number: G4055B