mrkrispy

Recipes 

Here is a common one:

http://www.beveragefactory.com/draftbeer/regulator/distributors/751-018.shtml

This doesn't seem to have any type of check valve, but you can build one yourself with a manifold:
http://www.beveragefactory.com/draftbeer/regulator/distributors/751-364.shtml

and get shutoffs with check valves built in:

http://www.micromatic.com/draft-keg-beer/gas-equipment-pid-1600CAB.html

(Micromatic also sells the complete manifolds....BeverageFactory gets most of their stuff from Micromatic)