I've got a 10 gallon Boilermaker and it does not drain once the liquid level drops below the dip tube junction with the pot (about 2 gallons left). Obviously, I'm losing suction because if I tip the pot towards the dip tube, flow resumes. I've re set the dip tube until it "clicks" a couple of times, but no help. I'm thinking I need a new o-ring. Anyone else have this problem and if so what did you do to fix it. Thanks.