Amazon.com : 3 Sets of Hunter PGP Seal Replacement Kit for Rotors, Hunter 253400, 3 Riser Seals (181500) and 3 Spring Seats (189900), Compatible with All PGP and PGP Ultra Rotors with
Hunter PGP-adj Rotor Sprinkler Heads - 6 Pack - Includes Nozzle Trees and Adjustment Tool (6) : Patio, Lawn & Garden - Amazon.com