How to: Install a Nozzle & Adjust your Hunter PGP Ultra - YouTube
Hunter pgp-ultra series rotors
Choosing a Hunter PGP-ADJ, PGP-Ultra, or I-20 Rotor - YouTube
Amazon.com: 3 Pack of Hunter 782900 PGP Ultra, Blue Nozzle Rack, 782900SP Nozzle Tree for Hunter Rotors, PGP Ultra and I20 Ultra Rotor Sprinkler Heads, Hunter 782900 Nozzle Rack Set, Includes LED