Originally Posted by theck
I believe you can also unscrew the first body so nothing flows and still have the second set. If anyone has a dual I'm curious now and like a confirm.
You can definitely separate them (just be careful you unscrew them correctly, they're LH thread). However, if you don't replace the high pressure gauge (or plug the hole), you're going to have an open vent at tank pressure (~1500 psi). That would be bad news if you opened the valve on the tank. Personally, I wouldn't mess with it.
Edit: Or are you talking about just setting one of the regulators to 0 psi? That you can do easily enough. Just make sure you shut off the valve as well or gas can slowly bleed through the check valve and depressurize your keg.