"Hard to find! Impossible to get, but we have them"
We now have available custom made Carbon Steel Female Metric O-Ring Face Seal Hose Barbs, in various sizes. These Metric Flat Face fittings conform to the GB/T 9065.3 specifications.
Parker, Gates and Eaton do not have these available, but we do in 1/4", 3/8" 1/2" and 3/4".