I have not been blowing out my system but I did have a valve go bad for some reason a couple years ago. How important are blowouts in Colorado? Obviously you are shutdown for the winter after the blowout but there are alot of dry spells in the winter I would like to be able to water. Hope you guys don't mind a post from an amateur. I am a window cleaner by trade and also work at the local grocery store. Also: Is five hours to find and replace a bad valve way out of line. I hate to complain because I work with the public too and I don't want to be a pain. Here is the case: I had tried to fix the valves by swapping top myself but could not find the problem, I had one station always on. They saw a valve with a little leak so they tried to fix that and it was not the problem so they dug it out and replace one or two valves, one had a crack in the base. Is 5 hrs at $65 per hour way out of line for two guys for this job. The guy was a little new at the work and they did not have a screw gun to speed things up or any spare screws or diaphrams. I will probably not complain but this does seem a little high doesnt it. They did have to dig down a good foot to get to the valves.