This is kind of a weird question. I bought a regulator (taperite double gauge) but the store should have sent me one with two outs, instead they sent one with one out. They will probably replace it with one with two outs, but the store is closed due to holidays and will not open again till next monday. I really want to carb a beer in my keg this week, or at least transfer it to the keg and purge the oxygen (don't have another fermenter free). My doubt is, if I do this, will the store know that I have already used once it when I return it? I know it is kind of a weird/stupid question, but I really do want to carbonate my beer this week. Thanks!