This is a first. I have a 5lb tank hooked up to a good primary regulator. From the primary is a length of tubing that runs to 3 secondary regulators that are plumbed together with pipe. There is another series of 3 secondary regulators connected to those via another short length of clear tubing. That piece of tubing has some dark beer in it so I'm guessing that I have some beer in at least one of my secondary regulators. The primary was showing that the tank was out of gas so I'm guessing that this was due to the kegs regulating the pressure between them. No I didn't have any check valves and now I know to get them. My question is... is there anything that I can do to recover from this or do I have to throw all of my secondary regulators away due to the suspicion of future infections?