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A 14mm to 18mm thread adaptor that converts the standard connectors supplied with the Colortune and Hi-Gauge compression testers to fit the larger spark plug sizes found on some classic cars. Set includes a soft copper washer to ensure a good seal ..

Adaptor for Hi-Gauge Compression Tester, Part No. G4101 and Colortune, Part No. G4074.
Thread size: 14mm to 18mm.
Suitable for most modern and classic cars.
Kit contains: 14mm to 18mm thread adaptor, gas seal washer and hex key.
Other adaptors available, Part Nos. G4055A (10mm), G4055B (12mm), G4055C (14mm tapered seat) and G4055D (14mm long reach).

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