Originally Posted by itsme6582
Pneumatic quick disconnects are probably the cheapest way to go and perhaps the simplest. Home Depot and Lowes sell fittings just like you found at Grainger. They should be by the compressed air tools.
these are very prone to leaks, especially the cheap ones. just keep that in mind. some people use them without issues, but others have tried using shop air QDs and have gone thru several CO2 tank fills before realizing they dont seal 100%.
for shop air- they only have to seal 99% so that the compressor doesnt constantly run. a very small air leak isnt anything to be concerned about. however the goal in a CO2 setup is to have zero leaks (100% seal) because CO2 isnt as readily available or as cheap as air.