tkcas01 wrote:
Mine have had 9 years of constant use full-timing, but no real sign of trouble.
Part of me thinks, "If it ain't broke, don't fix it," could just lead to more problems. My parents' rig went for over 20 years without them failing, but they did not use theirs as much as I do.
My vote is for preventive maintenance -- replace them.
My black tank valve was getting hard to open so I replaced it along with the gray tank valve.
Much easier to replace when tanks are empty until waiting for valves to fail with full tanks.
