I've never had problems with leaky keg lids until now. It used to be if a lid was leaking, I would simply turn it around in the other direction, and the problem was solved. But, this doesn't always work anymore. Now, I find myself swapping out lids until I get one that won't leak. I've even resorted to using keg lube, which I never had to do before.
How long before those black gaskets have to be replaced?
Visually, they look fine, but do they shrink over time?