Problem solved! Could not find a replacement "chuck" for my Air Station air hose. AutoZone couldn't help me but suggested I try my local Tractor Supply store. ( Those stores are great by the way. )
The service dept guy looked at it and said "maybe". He got a package off the shelf that contained a new air hose and chuck. He unscrewed the old hose out of the unit and screwed in the new one. Perfect fit. I've tried it and it works fine.
The brand name of the new hose/chuck is Campbell Hausfeld and is called "3 ft. Air Hose & Air Chuck." It cost $10.99 plus tax.
The new hose is not as long as the original one but it's quite adequet.
Larry