What is a sprinkler head?

Heads sit flush with the turf, so the only thing visible with the system off is a 2 to 4 inch cap in black or green, usually half-swallowed by grass. The fastest way to find them all is to run each zone from the controller and walk the yard. Bodies come in 3, 4, 6, and 12 inch pop-up heights, the tall ones for shrub beds and tall fescue. A rotor is obvious while running: the stream sweeps and you can hear the gear drive tick.

Spray heads throw 5 to 15 feet and lay down water fast, around 1.5 inches per hour. Rotors throw 20 to 45 feet at roughly 0.4 inches per hour. Those rates differ by nearly four times, so sprays and rotors must never share a zone, or half the lawn drowns while the other half burns. Both types assume head-to-head coverage, meaning each head throws all the way to its neighbors. Four failures cause most complaints: grit clogging the nozzle screen, which leaves a dry wedge; a riser clipped by a mower, which makes a geyser and a soggy patch; a head that has sunk and now sprays into grass blades; and a worn wiper seal that weeps a puddle at the base all cycle long.

Walk every zone twice a year, at spring startup and again in midsummer, and budget 10 to 15 minutes per zone. Pull and rinse nozzle screens, reset arcs that have drifted onto the driveway, twist sunken heads back up to grade, and trim the grass collar choking the spray. See how often to test a sprinkler system and the sprinkler system maintenance checklist for the full pass, and never skip the fall blowout, because a freeze that splits heads and laterals costs many times the service. Heads are consumables: a well-run system replaces a few every year and still reaches 20 years.