Aeroflow have added Metric and Imperial thread identification kits that are very handy for matching up fittings in the workshop or garage and feature a male and female thread so you can ensure ordering the correct fittings for your plumbing requirements.

Imperial kit includes male and female, 5/16"-18, 5/16"-24, 3/8"-20, 3/8"-24 (-3AN), 7/16"-20 (-4AN), 7/16"-24, 1/2"-20, 9/16"-18 (-6AN), 9/16"-20, 5/8"-18. The Imperial kit is especially handy for checking AN, ORB and hose end threads etc