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Hey,
Waittttttt!!!!!!!! Poly is not to be used for the mainline (leading to valves) it will pop under constant pressure, there you need to use copper or PVC, and poly to the sprinklers
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Are you saying that EVERYTHING before the valves (not the breaker, but the valves) needs to be copper or PVC? I TOTALLY disagree.
My mainline is a 300' piece of 1.25" 100psi poly buried in a horseshoe around my house. There's a 30 foot piece that runs from my vaccumn breaker to feed the mainline. About every 30 feet (on my poly mainline) is a 1.25 slip x 1.25 slip x 1" FPT that connects to a 1" jar-top valve (slips are double clamped on every connection). From the valves, I run 1" 100PSI poly to the heads.
I'm on a well with a 20 gpm 3/4 hp pump, which runs (average) 50 psi -- a 40 psi cut-on and a 60 psi cut-off switch settings.
I have NO manifolds built. Which means I used much less 1" poly (less pressure loss versus the 1.25" main to valves, less $$ wasted in 1" poly).
95% of the residential systems installed around here (MI) are designed and built this way -- IF the builder is any good.
Why, again, should I run copper or PVC instead of 100PSI 1.25" poly (330 feet worth)? There's no need.