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I was looking for this also. I found a compression fitting to connect air line to airline. I was gonna rig it somehow with robber washers but never did.
Kurtis
Home Depot has a slew of John Guest like fittings. They are made by Watts and labeled quick connect fittings. Come in ¼, 3/8 and ½…….and fit clear tubing. You can see where I used quick connect elbows for a sight tube in THIS diy.
Not sure of your application, but I tapped it directly into PVC pipe.
I looked at those, but could not find a nut or anything to fit the threaded side for the bulkhead. Guess I could have just tapped, but I was going for bulkhead
Kurtis