There probably is. My advice would be to hit a local auto supply or Industrial supply store (grainger or something similar). They will often have a wide supply of air fittings and adapters. There may be other ways, but that's my take.
my favorite headache/current project:
1/48 Panda F-35
"I love the fact that dumb people don't know who they are. I hope I'm not one of them"
-Scott Adams