What pipe size should I use for irrigation laterals?

Size pipe so water velocity stays reasonable (often under ~5 ft/s) and friction loss leaves enough pressure at heads. Many residential laterals use ¾" or 1" PVC/poly; larger mains feed manifolds. When in doubt, upsize—the material cost is small versus digging twice.

Still stuck? Contact us with a photo of the part label — we confirm fit within one business day.