Hunter ST-90-73 3" pop-up, jar top cap, adjustable arc, plastic riser, NPT inlet threads, and 2 nozzles - EvergreenSprinklers.com
Amazon.com : 3 Pack Hunter 269400 Protective Rubber Cap for PGP Rotor, Sprinkler Cap Replacement Rubber Top for PGP Series, Hunter Sprinkler Head Cap, Hunter Rubber Replacement Cap with Included LED Keychain