Rainbird F4FC Falcon 6504 Full Circle Less Nozzle. The Rain Bird F4FC is a 6504 Series Falcon Full-Circle Rotor Pop-Up Sprinkler (less nozzle). It features a water-lubricated gear drive for reliable rotation, a standard black rubber cover, a removable Seal-A-Matic check device to prevent puddling and erosion caused by low-head drainage, a self-adjusting stator that doesn't require replacement when changing nozzles, and a patented pressure-activated wiper seal and tapered riser stem on both plastic and stainless steel models to protect internals from any debris to ensure positive pop-up and retraction.
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