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Tuesday, July 29th 2014, 2:30am

Poly or PVC Mainline

I recently had Rainbird design my sprinkler system. They recommended 3/4 PVC for the mainline and 1 1/4 poly for the lateral lines. I have 18 gpm flow at 55 PSI. I also live in Wisconsin. Can I use PVC for the mainline in Wisconsin (Cold as heck the past 2 years)?

Central Irrigation

Supreme Member

Posts: 364

Location: Central Minnesota


Tuesday, July 29th 2014, 5:58pm

Do NOT use PVC for any of your sprinkler system. Midwest climates wreak havoc on PVC pipe. And the 3/4" mainline is a joke. Use 1 1/4" mainline and laterals (Poly of course) and neck down to 1" for zone lines.


Starting Member


Tuesday, July 29th 2014, 11:39pm

Thanks. Would it be okay to stick with 1 1/4" for lateral lines and zone lines for simplicity?


Supreme Member

Posts: 4,082

Location: Metro NYC


Wednesday, July 30th 2014, 7:45am

Simplicity isn't worth paying double the price or more.

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