A friend is having a party Saturday night and I offered to let him use my co2. I have brand new sanke about 6 months old that I have no used (use cornies at home). So, I hooked the lines to it and turned on the gas. With the sanke handle up (so no co2 is allowed out the base), it is leaking near the blow off valve. Is this normal? Shouldn't it be completely sealed or is it possible it will be fine once I hook it up and lock the handle down? I don't want my friend to run out of co2 Saturday night. Thanks!