Why PVC is not always a great idea?

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I had to replace the 1/2″ schedule 80 pvc elbow with a metal street elbow today, because of a small leak.  I am going to replace the solenoid later so I did not replace all the pvc for now.  I guess the weep solenoid (sprinkler system solenoid) may have worn out the pvc (from cutting on and off) and caused a small crack.

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I also installed the last Flojet pump.  Now I just need to put the last 2 Flojet pumps online.