Originally Posted by brewinchef_fairfax
Have you read the review on the need for a check valve to keep beer from back-flowing into the regulator?
I had a keg of ED Worts apfelwein that was pressurized at 40+ psi. Didn't think about it. Tapped it with 12 psi to serve. Apfelwein sprayed out of the regulator. I had to tear it apart to clean it out.
Micromatic deluxe regs. Keep in mind, most regs are designed with BMC kegs and couplers in mind. Those couplers have check valves built in.