Hi All,
I had a plumbing service call in a 35 year old home. I opened the access panel and observed the brand name cast into the valve -- it was a first quality name. Since I was dealing with a first quality brand, I decided to rebuild rather than replace.
I wrenched open the valve thru the valve stems. Surprisingly, the seats were made of stainless steel. Running my fingernail over the seat revealed no groves whatsoever. I installed some new dirt-cheap rubber seals and the valve sealed like it was brand new.
My friends.....many of today's failures are failures by design. We have the means to make better products but somehow the corporations running the show think a continuous money stream is more important than reliability.
Just a word to the wise.....is this what you want? Is this what you support?