I just picked up 5 more balllocks at a great price. The problem is 2 leak terrible at the pressure relief valve. The 2 that leak have the challenger type valve with the split ring on it. The other 3 have the valve that flips up and they hold gas fine. One of my other balllocks with the challenger valve leaks once in awhile too. I figured would buy new valves but they cost $15 a piece, that would screw up the great price I paid. I might be able to swap them for good ones with the seller. Has anyone had this problem and solved it with a little keg lube? I may try it if I can't swap these out with the seller.