I hope it is just a washer, in which case, I would use the beveled ones. But sometimes in the process of installing the new stems, they are not fully opened and when tightened in, they can crack the internal casting and cause a permanent, non repairable, leak.
: I'm about at my wit's end trying to fix my 2-handled tub faucet. It was leaking profusely from the spout,
: when both hot and cold handles were firmly closed. Both stems had been recently replaced (about one year
: ago, and the hot water seat was put in new at that time, also. I replaced the cold water seat, and both the
: hot and cold seat washers, and that cut down on the leaking considerably, but I am still experiencing a slow
: drip. When I removed the cold-water stem for the second time (in order to replace the seat), I noticed that
: the outer perimeter of the flat washer I had put in was pulverized (I assumed by the old seat?) But, when I
: replaced it with a new washer and installed the new seat, the infuriating dripping did not stop.
: I experimented with turning off the hot water to see if the leak was due only to the hot, but this only slowed
: the dripping up a bit. Any clue as to how to approach this problem? I wonder if I should be using
: bevelled washers instead of flat? Any helpful advice would be appreciated. The Chinese Water Torture
: is not doing my nerves any good.