was today at a Nursing home and take care of. We have not done any repair or maintenance except setting water times before now but we're starting to learn about replacing heads and such lately. Well today we replaced some spray heads...and i had to adjust them in 50 degree temps. I didn't know what i was doing so I learned the basics from my boss and then he would go inside to run the zones while i ran around getting soaked. Everything went pretty well except for i unscrewed one of the nozzles when the zone was on while i was standing over it...80 psi of water rushing into my eye sockets is fun....not... lol over all not bad.