Replacement set screw for Hunter PGP ULTRA and I-20 rotors (part 180900). This precision fastener restores secure fitting for rotor components so your irrigation heads operate reliably after routine service, repair, or part replacement. Keep this part on hand for maintenance and small repairs to prevent lost run-time or uneven coverage caused by a loose rotor component. Compatibility: Designed for Hunter PGP ULTRA and I-20 rotor models; reference part number 180900 when ordering or servicing. Purpose: Secures internal rotor components and nozzle/deflector assemblies to maintain proper alignment and spray performance. Installation: Simple to replace during rotor service—remove the rotor cover or nozzle, seat the screw in the designated threaded hole, and tighten to manufacturer guidance. Maintenance tip: Inspect set screws during seasonal start-up and annual maintenance; replace if worn, stripped, or missing to avoid uneven watering. Service note: Use only the correct part number for compatible Hunter rotors and follow Hunter's published service instructions for torque and installation procedure. This replacement set screw is an essential spare for irrigation professionals and homeowners maintaining Hunter PGP-series rotors. Keep the part number (180900) available when confirming compatibility or ordering additional components. If you are unsure about fit or installation, consult the rotor manual or contact a qualified irrigation technician for assistance.
