The KingLok adaptors/quick disconnects are compatible with Andale (Snaplok), Lancer Pacific (Fatlock) and other brands of draft beer quick lock fittings that are often seen in commercial pubs and bars.  Often called K lok adapters

These check valves are designed to fit LIQUID flow lines.

They are made with 5/8 male threads. Depending on what size of gas line you are using you can choose from multiple different hex nut and barbs.