I looked today at a customer's system to turn it on. It was brand new and installed after the secondary was turned off for the year. Never had water in it. I checked the main shut off and noticed the pipe was some of the "green line" poly. I couldn't see any markings on it, but it looked like the thicker low density pipe I've been using on laterals. All all the high density that I have used as main line has been thinner walled and more ridgid that this stuff. Has anyone seen high density poly that has the thicker walls? I'd hate for this customer to have leaks in the main as time goes by. Better to get the installer back to change it out now. Nice install, they used a gate valve for the main shut off instead of a ball valve, none of the field wires were connected to the solenoids and I found a spray head in a flower bed that was out of the ground and on it's side. Haven't seen the clock, but I'll bet it's a piece of work if there is one. They ran a piece of poly down on the front of a 10 foot tall rock wall and never covered it. It just goes down and into the gound out in the sun and fully exposed. Poor lady had it installed as part of the new home purchase. Nice expensive house, but the install that I have seen makes me wonder.