I try to keep a small compressor in the trunk... for those "Oh Crap" moments. The better of them the plasitc locking lever broke... I hate to throw the unit away for a dumb coupler. It's a small hose, undoubtably some metric size. I was thinking of a hose barb to pipe, then a coupler. Then a lock on air chuck... Seems complicated. Any ideas?

Personally I would see what fitting is on the compressor and see about replacing all the hose and the air chuck as a unit with something standard. Might talk to this outfit and see if you can a self-locking chuck... http://www.jjandaracing.com/contents/en-us/d24.html