Cut them carefully to make sure the sprinkler heads will be at the correct height. Set the watering controls for each circuit, then test the system by opening and shutting each circuit. Backfill the trenches, then water the soil down thoroughly to compact it. Add more soil until each trench is slightly raised, then replace the sod or reseed. The type of material you use to install your sprinkler system will depend on the manufacturer's recommendations.
Some systems use flexible pipe, plastic or metal inserts, and clamps.
Other systems use PVC pipe and fittings. This sprinkler system requires PVC pipe. Be sure to use PVC cleaner on any PVC pipe project. 9 illustrates how to connect the PVC pipe. The cut should be as square as possible to insure a leak free installation.