Get an accurate read on your engine parts with the ABN Engine Compression Test Kit. The 18mm adapter has an Internal thread size of 14mm 1.25mm and outside thread size of 18mm 1.5mm to snugly attach to the 14mm hose threading for a universal fit on most plug types.

Brand: ABN
Manufacturer Part Number: 5056
Size: 2.5
UPC: 688295865056