Originally Posted by lawns Etc
I think Mike is living in a non realistic world.
Lucky me. What I was trying to get at, is, in my thirty years, a valve will fail at 4.30 pm on a Friday afternoon (on a long weekend). Without knowing where the valves are, the system will have to be shut down ( if you can find the shut-off) until the offending valve (forward flows are the worst) is located. Feel like working weekends?