I will be installing my own system soon. The parts store I have talked to said to use 200 psi pvc. Isn't schd 40 stronger? I will be driving across my yard some and would like to have the pipe as strong as possible to try and avoid breaks. I know to go as deep as possible at those points, but wouldn't sched 40 help? Also, does anyone make a 9 station control box? Thanks, Larry
