Gunson G4055B Adaptor Kit 12 mm
- Adaptor for Hi-Gauge Compression Tester, Part No. G4101 and Colortune, Part No. G4074.
- Thread size: 14mm to 12mm.
- Suitable for classic motorcycles and two stroke engines.
- Kit contains: 14mm to 12mm thread adaptor, gas seal washer and hex key.
- Other adaptors available, Part Nos. G4055A (10mm), G4055C (14mm tapered seat), G4055D (14mm long reach) and G4055E (18mm).
This kit converts the thread on Colortune and Hi Gauge Compression Tester to fit 12 mm spark plugs holes