Draper expert 200mm long reach adaptor for petrol engine compression testers draper expert 51012 b i expert quality i b suitable for use in conjunction with petrol engine compression testers i e draper models dct1 and pct1 and similar products on engines with deep recessed spark plug apertures i e ford mondeo renault thread sizes 14 x 18mm with adaptor 10 x 12mm display packed draper expert 51012 200mm long reach adaptor for petrol eng compression testers