Hi dicko, I am looking into using something along these lines as a secondary regulator, but know nothing about them. Would you mind explaining what you mean here a little bit more? As I understand things (which means next to nothing), you set the desired pressure for the device (in this case, your keg) on the "out side" of the regulator and it lets air (or for us CO2) through until the back pressure from the keg reaches your setpoint. At that point, it stops letting more CO2 through. But if I understand your comment, these types of valves don't stop letting CO2 through, they just shunt it out into the atmosphere as opposed to completely stopping the flow. Is that what you mean? If so, you'll drain your gas bottle in not time at all!
thanks for clarification.
matto